I say just play them all, they will all give you a different experience. My fav on the DS has to DoS, i loved the castle layout, the soul system and the different variety of weapons, plus the Julius Mode was great. PoR was nice as it was fun playing as a belmont, but the tag aspect of it put many people off and it was a pain to level up the sub weapons, the portraits were nice but a lot of the rooms looked the same and the maps were quite small but i thought Richter mode was fun. OoE is alright to me, i like the level designs but i hate how short the maps are, the glyph system is good but the lack of weapons kinds of puts me off. I liked the difficulty of the game, it was nice to have a challenge as the other two were a bit on the easy side for me.