Id say keep what you have
The classics you get from the subscription is limited and they arent yours to keep, just borrow
But the upside is you can access them even if youre offline
Depending on what you already own, some games might be harder to come by/find or be more expensive to get physically, it could be a hit or a miss but its not like NES games are in circulation anymore
But the switch is definately a great console/device
If you arent hard up on cash, id say buy a switch, but then get a pro controller and even a better controller/grip for handheld mode, I absolutely hate the joy con controllers and bought an after market grip/controller with a d pad, bigger triggers with 2 programmable turbo buttons and its much more comfortable and easier to play games with