Art 300 and Ilford Warmtone are the same / similar emulsions... and behave like each other in all respects.

The difference is the weight and texture of the papers with Ilford Warmtone being slightly thinner and gloss which drys down nicely to a no glossy surface.
Art 300 is heavily textured and works well with some of my subject matter.
Philippe is quite correct , both are significant choices but yours alone.