I love the 3DS. I think it's one of the greatest gaming devices of all time. The quality of games to come out over the course of the DS/3DS'slifetime are stellar.
The Switch's portability conflicts with the 3DS imo. It's hard not to see how the Switch could very well be the 3DS's successor.
That being said here's my concern and a concern I'd imagine many big city gamers like myself potentially face. I would not feel comfortable pulling out the Switch while riding the train. Pulling that thing out paints a giant target on your back for thieves. Especially here in NYC.
Yup. That's my primary concern, safety. That's all.