In the emulation community, newer does not always mean better. While modern MAME versions support thousands of additional games with hyper-accurate emulation, they also require significant computing power.
Because the demand is high, so is the risk of malicious files. A "hot" set isn't just popular; it must be . Before you download, look for these signs: mame034romset hot
Pros: You can cherry-pick individual games and delete the rest without breaking anything. In the emulation community, newer does not always