Why use a VPS tbh? My laptop can run at least 12 bots at once (tested and confirmed) and I also use my friends laptop (roomate) so 20+ bots without paying for a VPS plus getting a shitty desktop soon to upgrade and run more bots. lol just saying, im sure he has the equipment to run that many sorc gardens if he says he is going to.
OT: I would say either RC if you have 91 or mining and sorc garden because most resources are going to rise both because pking uses up resources like crazy and the old wilde return will soak up the resources like a sponge driving the price up, and also having resources in large quantities will be helpful because with the GE like an auction house and W2 fally trading returning with the free trade implication, being able to buy 100k gold ore at once will be much better and therefore more costly than having to advertise "buying gold ore" for hours on end, or having to scower the new auction house buying the ore 1k at a time. I would say any bot that collected resources such as logs, food, runes, ect.... is going to be the best.