Question: Briars vs. Meerschaums, and Tobacco?

[birddawg]

I currently have two briar pipes and a meerschaum, and another meerschaum being shipped to me this week. My two questions for you guys are about smoking different tobaccos in the same pipe:

1.) In general, do you smoke only one or two blends of tobacco in a briar pipe, or doesn't it matter?

2.) How about Meerschaums? Can you smoke different blends in the same meerschaum or should you just stick to one blend per pipe?

So far I've only been smoking my briars with one blend per pipe and was wondering if I should keep doing this or if I could try other blends in the pipe. Thanks