That depends on if you want a Vita to play Vita stuff. The Vita is definitely built far better than the Switch, so there's that. The Switch in my possession is showing all of the now-common problems except for bending/warping, whereas both of my Vitas are still rock-solid (and I've been far rougher with them, though not on purpose mind you - I'm just clumsy as hell).
I'd buy a Vita over a Switch any day... except I already have two so I don't really need to do so. And before anyone accuses me of being a Sony fanboy, I'm not. I hate Sony at least as much as I hate Nintendo, but like Nintendo, I still own most of their consoles.
I'd get a Vita just for the Vita and PSP library.
Also, fantastic OLED screen that Nintendo can learn something off.
In all seriousness tho, if you get a phatty Vita, get a controller grip as well.
Makes the thing so much better.
OLED only on the original 1000 model though, and most readily-available models are 2000s. Eh, the OLED screen
is better, but not by enough to recommend the 1000 over the 2000. The only reason I mainly use my original is because I have a PSVSD installed, plus I like to use real game carts instead of the SD2Vita (though I still would like to get one for my 2000). Otherwise, the 2000 has arguably better buttons, much better battery life, and it's both lighter and thinner.
Actually, the 2000 is the one I'd rather get a controller grip for, but since I've never got around to buying one for either Vita, I can't comment on them. They look like a great idea though, especially with the proper R2 and L2 support using the rear touchpad.