I agree. I'm not trying to start a debate here, because it's useless. Everybody is probably very firm in their opinions, and nothing anybody says will change that. I know that's the case with me, and I'm probably not the only hard-head here.
The reason Schumacher is so highly regarded is because of Ferrari's domination, lack of real teammate (I love and respect Rubens, but way too accommodating), and lack of competition (mainly from other teams). Put Juan Pablo or Mika in the other Ferrari seat, and Schumacher wouldn't look nearly as good or consistent. Put Senna in a seat opposite Schumacher, and he would be downright humbled. But since Senna's career was cut short, at his prime, it will remain pure speculation.
But I repeat my vote:
SENNA SENNA SENNA