New 2x12 Cab Day (Avatar / creambacks)

Got an fresh new avatar contemporary 2x12 blacked out.
Loaded:
-celestion creamback M-65
-celestion creamback H-75

Sounds glorious. The (H) add a little more lows and presence while the (M) brings some cool greenback-y mids and grind.
I was hoping they would mix well, and I was right.
Pure tone, sound great with the MTS stuff also.
This cab is quality, I took the back off as soon as I got it to look inside, reinforced dado joints, thick void free birch, superb tolex, made in USA. These guys got cab making down!

Sweet as honey!

Im trying to find the best speakers for Extreme Metal...
Some valued friends say Celestion T75s while others say Eminence Swamp Thang in an X pattern with Texas Heat.
I want a tight, responsive & percussive Speaker cab with great bottom end but still great for shredding solos!
What do you guys think? experiences? have any of you tried these cabinets side by side?