I used to strongly prefer physical copies of games so that I knew I owned it and fully controlled where it could be installed and when, as well as having the manual and whatever else comes in the box. To me there was something to be said for holding it in your hand, and I felt this way up until 2012 or so.
I've had an account at GOG since 2009, but I didn't truly discover GOG until 2012 at which point I really appreciated the fact they sold DRM-free games and the general GOG philosophy. I also liked the fact that they got ancient games to run relatively pain-free on newer OS releases as much as possible, and that installing a GOG version of any particular old game would most likely be a lot less pain than trying to get an original game CD/floppy to work on a modern OS manually fiddling with DOSbox or whatever.
Over the years I have accumulated tonnes of games on CD/DVD, movies, TV shows, magazines, books and other entertainment products and learning materials, etc. I have so much stuff I'm tripping over it constantly, it just takes up way too much space even packed into boxes shoved in the basement where frankly they probably wont be opened up very often if ever.
Ever since realizing this, I've had a change of view and preference. Nowadays I prefer my games to be digitally distributed because I find it far easier to keep track of them, know that they are not going to have a scratch on the DVD that prevents installation, I don't have to look around the house to find them nor trip over them, and they come with artwork, soundtracks, maps and other stuff all digitally and I don't have to trip over any of that either. On GOG.com I can download all of my content and keep a backup of hundreds of games on a single hard disk tucked out of the way, or multiple copies if desired, and/or I can install over the Internet via Galaxy if I wish to go that route and ensure I have the latest version automatically.
Years ago I was rather opposed conceptually to online services such as Steam and gaming clients because I feared that they would completely remove all control over the software from my hands and provide a completely poor end-user experience. I had reasonable fears over things that had not come to be, and some unreasonable ones too. I wasn't opposed to the idea of a gaming client, but I did fear the control such software might take away from me as a gamer.
Now here we are in 2016 and the majority of games are digitally distributed and/or require a digital distribution service even if you buy them in the box. I no longer buy games in boxes anymore and don't want the extra clutter around the house anyway. I now prefer digital download games and prefer them to be DRM-free wherever possible. When it comes to gaming clients I personally am all in favour of software that can make my life easier overall.
Gaming clients: When I look back at the 1990s and early 2000s at how we went about patching games by searching the web for game patches, then having to go visit each individual game company's website and search for a half hour to find a patch and not be sure it was the latest one half the time, and also possibly have to create an account there to even get it, I don't miss that at all. Personally I like the idea of having a program to organize, install, launch, and update my games as well as providing other value-adding features that I perceive to improve my own gaming experience. So in terms of features and ease-of-use, I like programs like the Steam client for example in terms of the features it has that I perceive to add good value to my gaming experience. It's not a flawless storybook love affair however either, as there are aspects of the software that I dislike as well, and further aspects of the way individual games handle things (such as DRM) that I may or may not approve of.
Nonetheless, despite there being flaws in the current way games are marketed, sold, and distributed online and flaws in the overall gaming experience that vary from service to service and game to game, I strongly prefer digital distribution nowadays over the days of tripping over scratched DVDs peeking out from under the couch. Digital distribution has made it easier than ever for me to play the majority of games overall, and despite any per-game drawbacks it might have. This is not to say that the experience is flawless or without fault however. There are pros and cons, but overall the way I personally embrace the technology focuses on the pros and try to avoid the cons wherever possible. For me, GOG is full of pros with very few cons, so this is my preferred service.
Similarly, I prefer movies, TV shows, books and other media and content to be computer based and digitally distributed in some manner or another. I can literally see the rug now, yay! :)