Playstation 2.
It was my first game console i really started to collect for and is my biggest collection. Also it can play playstation 1 games. Didnt have to deal with DLC/Half Made Games. Also alot of games had good quality + very long.
1) Shin Megami Tensei Series (Nocturne, Digital Saga, Devil Summoner)
2) Persona Series ( P3F, P4)
3) Disgaea Series
4) Grandia Series (Grandia II, III and Xtreme)
5) Xenosaga series
6) Atelier Iris Series
7) Tales series
.hack series ( original + G.U.)
9) Jade Cocoon
10) Metal Gear Solid series
11) Final Fantasy Series
12) Dragon Quest VIII
13) Dark Cloud ( 1 and 2)
14) Shadow Heart Series
15) Wild Arms Series
16) Zone of Enders
17) Haunting Ground and Rule of Rose
18) Ar Tonellco series
19) Front Mission 4
20) Suikoden Series
It was simiply put.... RPG Console Paradise. That i never had to worry about not having full game, or be flooded with needing to buy Bunch of DLCs. Pure and simple awesomness. This mostly just from RPG side. It not even mentioning all other great games that fit anyone's need/style.
Only thing you didnt have on PS2 console was either Halo, Mario, Zelda. >.>