Quote (oxalis @ Apr 8 2012 04:20pm)
The rewards are all exactly the same as survival. As far as spawns I don't know as I never do it. (I'm imagining it's much less than survival considering it's a lot more challenging, no dps and no repairing)
The only thing I do know, is that you need to conserve your upgrades since they're the only way you can repair during waves, and that you have to sell things once they hit 3 star since you won't be able to repair a 3 star during a wave (for walls that is, ballistas and stuff shouldn't be taking too much damage)
sounds about right to me. I've never had the patience to play pure strat to 15 though. Lots of people say it is easier though.