Most of the best games in playability are affordable. Easiest to find. Plenty of different joysticks available, with one that will fit you. Easiest to trade with other collectors Most variety of games. More bad games than good.
Many tougher games get quite expensive.
Greatest challenge in getting all the games. Some arcade classics only available on this or 2600. Some of the games are inferior to other equal systems. Tougher to trade. Best versions of many arcade classics.