melee on slow mo has more competitiveness than brawl, as there are so many more factors to take in to account. I don't know where this whole faster = more competitive argument comes from or how it makes sense. Seriously, can we go ahead and say tic-tac-toe is more competitive than chess because in tic-tac-toe people generally come up with their moves faster? No, because if you sit down and document every possible move option for both sides, and play out every possible game (which I did once when I was bored for 2 hours with nothing but pencil and paper), you soon realize that EVERY match will end in a draw if both players know what they are doing. This MAY be true of chess, but the MASSIVE amounts of permutations in gameplay make figuring every game out practically impossible, and allows every game to be different. I have played chess competitively in tournaments for 4 years now, and I don't think that I have ever played the same game twice.
The real things I think make melee more competitive would the increased sheild stun that allowed you to overcome sheilds with things besides grab. Also, light shielding added more options for the shielder and gives the offensive player more to think about. The fact that spacing can determine where your opponent is sent makes the ability to make large combos deceptively hard, as you need really precise spacing. In brawl, spacing doesn't matter nearly as much, imo, as no matter what the distance you are from your opponent when you connect with that attack, they can probably sheild grab you anyway. Also, combos are in melee. I think we all know that though. There is a lot more to add like edgeguarding tactics and a broader selection viable movement options opened up through AT's, but I'll stop here. That's my 2 cents.
I expect this to be locked soon though...