I played and enjoyed both, but I think this is because of my past with BG games, let me explain:
Until very recently I've only had BG1. In the past I checked some modding sites, but I barely spoke English, and I was having a hard time understanding the install instructions. So I gave up on modding, and just played vanilla. A lot. (the only "mod" I used, was a fan-made translation, without that I wouldn't have been able to play at all)
(+ as far as I know, in order to mod BG1 you need to have BG2, which I didn't have, so even if I spoke English, it wouldn't have been much of a help. Correct me if I'm wrong here^^)
I haven't played BG1 in a long time, until the EE came out, which I bought and played. Since I had no experience with mods, for me any new content was welcome.
I played the original BG2 for the first time very recently, and I'm going to play the EE now, when I have time. Again, since I have no experience with mods, I'm happy with any new content I get.
I tried to check modding now, but I'm kind of a noob, and for someone like me, who can't even install plug-and-play TES mods without hopelessly crashing the game, BG mods are just too complicated @_@ Maybe I'll try later, but definetly not now, when my real-life is just too busy to be bothered with video-game mods.
(Ok, I have a confession to make: I did use *one* copy-paste mod for the EE: An interface retexture mod, because that blue interface gave me eye-cancer ._.)
So I, personally, liked both the original and the EE. Except the blue interface. It was a pain to my eyes. It had got to go. ASAP.