The TheraFlow TF-333 is the stronger overall choice for most people looking for a simple, effective wooden foot massager for plantar fasciitis and heel pain routines. Its biggest strength is a sturdier, more stable platform feel with varied textures and the added reflexology chart; its main limitation is that comfort can be more foot-shape and size dependent, and a few users mention initial odor or width preferences.
The TheraFlow TF300 remains an excellent budget alternative with a major advantage in portability and easy under-desk use. Its main limitation is stability—some users find it can slide or tip when applying focused pressure. If you’ll use it daily in one spot, TF-333 is easier to live with; if you want compact and cheap, TF300 is hard to beat.