Alright,
-BG2's engine is superior in all respects (character customization, combat options, graphics, more spells - including spells at early levels not available in BG1 except through Tutu, more exotic weaponry, etc.), but BG1's engine has it's own charm which I love as well.
-BG1 & TotSC takes the PC & party from class level 1 to 7, 8, 9 or 10 (depending on the class of your PC & party members), based on the enemies found in the game. BG2:SoA & ToB starts the PC & party at level 7, 8 or 9 and eventually take them *way* beyond that based on the enemies found in that series - many of which are epic level. That alone qualifies BG2 & ToB as the better games.
-There's more party banter, dialogue options, romance options, and more dialogues specific to the main quest in BG2 than what's found in BG1. Thus the main story & subplots in BG2 are 'more involved' & than in BG1.
-The modding community is more active regarding BG2:SoA & ToB than it is for BG1 & TotSC.
-While there's more joinable NPC's found in BG1, the joinable NPC's in BG2 have even more character depth, and are even better adventurers (by virtue of the improved game engine). This of course includes the joinable NPC's found in both games.
That all being said, BG2 is widely known as the better game than BG1. I was also introduced to BG2 before BG1, and the transition was seamless as the intro to BG2 does an excellent job of filling you in on the main details of BG1. So if anyone wants to start with BG2, they're welcome to do so (but even I now acknowledge it's better to start with BG1).
With all of that in mind, I used to say BG2:SoA & ToB is my favourite game, w/BG1 & TotsSC as my 2nd favourite. But the thing is I started playing BG1 again earlier this year RIGHT AFTER finishing up Planescape: Torment for the 1st time. That game is known as the definitive 'story in a game.'
With my experience in PS:T, I decided to immerse myself as much in the story in BG1. Before when I'd play BG1, I'd simply put major emphasis on the combat, possibly due to playing BG2 before BG1, and hence try to overcompensate due to not having all the tools found in BG2 to aid me in BG1. This at the expense of BG1's story.
And what I've found is that, in it's own way, BG1's story is as involving as SoA & ToB's story. You have to read between the lines more in addition to all the things AudioCG wrote a few posts before this one, and I found it tremendously fulfilling. It's all encompassing, from exploring all the details of the game world, talking to NPC's, choosing party members, meeting famous Realms people, the various threats found everywhere, the political & economic troubles, reading between the lines not only of the dialogue, but what you perceive, and of course, watching your PC & party grow through it all.
With all of that, BG1 now joins BG2:SoA & ToB as my favourite games.
Post edited September 21, 2011 by bladeofBG