What is the rest of your system? If you will use single-ended connection to the amp than CJ ACT2 is better choice(ACT2 is inverting phase as all CJ products). On the other hand if you will use balanced(XLR) connection to the amp REF3 is far better choice! IMO, REF3 is the best balanced tube preamp on the market and one of the best in general!
Fully agree with Oneobgyn.
Fully agree with Oneobgyn.