Yes, a so-called Strobist setup (a radio controlled off-camera hotshoe flash/speedlight) can be great for learning and experimenting with basic off-camera lighting, even while it won't deliver the same way a proper studio strobe setup would.

However, if you can find a studio setup with two lights and two softboxes for less than a TT350+X1T, the chances are good those aren't actual proper studio strobes, those are usually cheap CFL continuous lights that don't have the power output of even speedlights. They may be good for video and previsualizing, but for portrait shooting, could be very underpowered. And they're not at all the same as more powerful studio strobes with proper modeling lights.

But. The Godox TT350 is also kind of woefully anemic when it comes to light output, and if you're shooting with a Nikon dSLR, you don't need the tiny size that makes it so prized among mirrorless shooters. You'd probably be better off with the slightly-more-expensive TT685-N (Quadralite Stroboss 60) for event work, and for off-camera work because of the higher light output.