Which integrated?

The A50T was “voiced” to emulate the sonics of vintage McIntosh tube gear.  I had one a few years back myself.  Excellent integrated.  

No experience with Bel Canto but I own the Cayin A-50T driving a pair of Nola Boxer S speakers and it is an incredibly satisfying combination, probably the best sound I've had in 50 years of swapping gear, both tubes and SS, some of it considerably more expensive than this combination. The Cayin is a remarkable bargain.
The stock tubes with the Cayin are pretty good, new production Russian Mullards in mine, but I think it's worth the money to switch to Gold Lion KT77s. 

I'd go with tubes over any class T amp like the Bel Canto, assuming the speakers are fairly efficient.

The BOM on the Cayin is probably twice that of the Bel Canto.