Sega Ages for Switch
I am impressed by the current collection of Sega Ages games for the Switch. These games are not simple dumps of ROMs run on an all-purpose emulator, but rather have sensible additions and minimal lag with emulation by M2 that surpasses anything I've used elsewhere. The better-than-arcade version of Virtua Racing is perhaps the most impressive of the bunch so far.
Hopefully Sega has M2 work on arcade series like Virtua Fighter, House of the Dead, Virtua Cop and Daytona.