I'm nearly at the end of PPL course having used Pratt throughout - never used the Thom books so can't compare them for you, but Pratt has never failed me.
There are a couple of inaccuracies in the PPL Confuser, particularly in the Nav paper, but don't remember any problems with the Air Law one.
So anyway, I'd recommend the Pratt book. Good luck and don't give up the dream of flying!