I think archmage is going to be a better option for a premium bot service, but splintermate offers a great deal more multi-account management features that I feel make it more worthwhile for Silver/Gold accounts.

I had one battle where splintermate ran an all melee tarsa squad in Back to Basics, so while the win rate is pretty strong, there are enough questionable teams that I think make Archmage the better, albeit, more expensive option. Splintermate is also only 1$ a month per bot, which almost impossible to beat in terms to value.