HotS can bend to your will much more than vanilla SC2, similar to BW. There's always the risk that people will figure out the best way to play is to go for some passive turtle, especially with toss, but Blizzard is pretty good with patching and they are closer to all the races being even than WoL ever was, without going "you have to kill him in 10 minutes or die in lategame and you have 50% chance that will work, so it's balanced"
If you like RTS, it's pretty much no-brainer, it's funny how probably the biggest competitor right now is the HD re-release of AoE 2. Nothing else has customs, but if you want to play DotA, you are playing LoL/DotA/HoN already anyway. Keep in mind they finally put in global play, meaning you can play on any server with single copy, similar to how D3 works, you get to make new character and you have to rank again, letting you smurf a bit. I also don't have to beg people for US account to beat Tenks. SP of WoL was pretty good, albeit with shitty story, HotS seems to be the same, including the story. I'm also sick and tired of F2P, just forking over some base amount without the game constantly bugging me for more is a godsend (I'm looking at you, Valve)
When I get my hands on HotS later this week, I'll make an official rerolled clan/group on US, unless one of you will grab it first.