Sassy ...
You can bet on anything for which the betting shop can give you a price.
(I always suggest telling them the day before you're going to place the bet, so they can find some odds)
I've been choosing the teams based on ...
... recent results in all matches
... League position
... home advantage
... recent record against the specific opponents
... availability of first choice squad players
... and so on.
And if you watch the Superleague matches on Sky Extra, you just get a hunch that a particular team are "on a roll" ... that sort of thing.