Gemma is Google's distillation of their larger Gemini model (at least that's my understanding.) Qwen is alibab's model. Qwen is usually very good at code, gemma tends to be a little better at everything else.

There are Deepseek distills that use either qwen or gemma as a base. I haven't been impressed with them though. TBH I've felt like most of the reasoning models are overhyped.