Re: Which is your favorite speaker?
For clean, I'm a big fan of the JBL Orangeback (D120F, I think) that are in my '75 Twin Reverb.
For just about everything, I think the Celestion Vintage 30's are a good choice. The styles I play range from very clean sounds with compression, delay, etc., up to moderately overdriven (TS-9, etc.) and raunchy (Mesa lead channel) distortions. But not metal.
Other speakers I've tried are
1) EVM-12L (200W, very tight response, very efficient, but in no way could they be referred to as "warm" - brittle is more like it). Good if your main goal is power capacity, and if you want clean that stays clean all the way up.
2) Jensen C12N. Can't say much about them. I have one in a large 1x12" cabinet now. Tried it out in a Mesa Maverick, and it was not as warm as the Vintage 30, but sounded warmer than the stock Celestion 90W (Black Shadow) that came in the amp.
3) Celestion 90W (Black Shadow). Mesa puts these in a lot of their amps, and now that I've tried other speakers, I must say that I am not really impressed with this speaker. Guessing it's preferred for power handling, but it isn't that impressive.