I have a Genesis, no Everdrive though. I'd get a Jaguar, but the price for one on eBay is too high for the reward of the games I'd play. Since stores sell Jags at about eBay prices, no luck there. The SMS has more games at a cheaper price, just don't know which games are good buys.
In my very subjective personal opinion the SMS is a great system if you're willing to import games from Europe (particularly if you have a 50/60 hertz swappable TV) but rather mediocre if you're limited to the US game library.