When Zerg, he always goes 9 Pool, 6 lings attack, and then techs to Lurkers, looking is there detection, if yes, he just sits just out. He never uses Mutas, he may switch a bit to Hydras, but not plentiful, he builds slow and has loads of resources all the time, and finally builds a lot of Ultras and Plague Defilers. Never uses Swarm.
When Protoss, it is 2xGateway, imo likely, or FE. Then some Goons and Zeals, probably switch to Carriers and Corsairs late game, Recall likely. (almost surely one will pick Toss)
When Terran, and this is a least likely pick, never MnM, always Tanks, probably some drop. BCs quite possible, as are sneak Wraiths. Vultures never used, no mines. Science Vessels just for detection, too slow with APM to use EMP.
So I expect PP or PZ, very maybe PT. PZ most likely, but I choose eventually.
As for my abilities... My macro is far better then theirs, but I don't fell comfortable sacrificing it for micro on faster and fastest game speed. Therefore I rarely use Storm, but can manage Stasis Arbiters.
My apm is usually 80, their is 40-50.
If it is a land based map I expect 2 gate 6 lings push. If it doesn't work, expand and skirmishes there and then.
If it is an island map, probably air asap, drop perhaps one shuttle with 2 tenks on ledge, or 4 zeals, something like that.