i can't say i'm a fan of either of those heads, but i do like the 350h more than the 450h.For the vast majority of my jobs I use a 350h and a 410he.
The volume on the amp is never past the 9:30 position.
I do not use the EQ. I own both a old SVT and a B-15 so I know what killer tone is. My 350h is more than useable.
Plenty of tone and volume. Use one yourself THEN poo poo it.
I think it won't be as easy.