I'd probably say the pro 2 2028 simply for the practicality of it. The classics dont have any sort of self prime feature so you need to prime then yourself by sucking on the tubes to get the flow running.
Another option is the one I have, the pro 3 2075, again a little more expensive than the pro 2 but not by much. I dont know where you're looking at them and at what price but I got mine from charterhouse-aquatics.co.uk for £170 complete with all media.
Its easy to prime, clean and maintain, provides great filtration and mine only requires cleaning every 4-6 months.
Andy