I'd either have to go for 2002 or now tbh.
If I had to choose between the 2, I might stick with now, simply because of the different PvM experiences and ease-of-access for various things. Magic was bloody expensive to train in RSC, due to no RuneCrafting. Add in the GE for buying those random, hard to find items, and you save a lot of time/effort (I used to not mind walking across RS just to get 1 item I needed, but now I could never bother with that).
Anywhere you place a time period in RS2, there were still mass amounts of botting, whereas in RSC it was more like a community (especially with not having a level beside your name except in the Wilderness, a lot less people calling people noob!).