I'd like to know which is better for an arena map. Would it be better for the players to pick their spells individually, or would it be better for the players to pick a spell set?

Personally, I like to have set spells. It makes each hero different and unique. It also makes the heroes balanced.

For B.net in general, spells set.
For epic players that really appreciates the good maps, individual spell pick-up
You might want to take a look at Hydra Arena to get a better feeling of that kind of arena map

Spell set. Individual selection = people finding the most imba combinations and abusing them. It also = lack of distinct heroes.

Thanks for the insight. I think I'll go with set spells.

Don't forget to look at Fuel Tactics Arena for indv spells too!! .. i ought to upload that <.<