Jadis i50 manual

I-50 was specially designed to work with KT150 through adapted diagram and specific output transformer for power tubes optimal use. This integrated delivers 50W per channel in pure class A and is equipped with digital input ( USB) for a direct connection to a computer. Jadis I50 vs DA50 signature. Hi all, what would you all comments for the two Jadis model above？ If power wasn't taken into issue？! Or simply go for the JA30？ I have some tube preamp as well that should be easily fit well into the JA30. But for tube amps, I have bias for either KT88, KT120 or 150.