Favourites: PS2 (loads of exclusives, niche and triple-A mixed together, beautiful), Vita (fab system, a small pool of games to go at).
Least favourites: N64 (terrible boxes, extremely low availability of good condition games at reasonable prices), PSP (missed the boat, already skyrocketing in price and so many of the games worth having weren't released in PAL territories, UMDs are achey-breaky and the damned read-surface can still be scratched to hell).