I am curious to see what the forums prefer. I did a search a could not find anything.
I have been playing both as of late and this is my take:
Halo 3- More floaty feeling. Harder to aim/kill a person which leads to not dying as quick.
Halo Reach- Much faster gameplay. Die very fast. Sniper is extremely powerful. grenades are nuclear.
I've also noticed that effective strafing/ aiming is different in each of the two. I feel like an effective H3 strafe is slightly longer steps
As we are deciding how competitive the game is based on the pros opinions, then default Reach is the most competitive. After all, Ogre 2, statistically the best player, said "No bloom = no skill". And as he's a pro and we aren't, he must be right.
It's baffling how people can say H3 was more competitive than Reach v7. Yes, you may find it more enjoyable, and there's nothing wrong with that. But to say it is more COMPETITIVE is flat out wrong.