Ha!
Better or not is relative.
I personally absolutely love the SIT3 but only on my Avantgarde Duo XD. The Valvet is a very close second if not tied because it’s a little more open and brighter than the SIT3. The Valvet is a little more lit from within but works on more speakers than the SIT3. The XA25 is wonderful but very neutral in my opinion and much more powerful. On the speakers that the SIT3 and Valvet E2se won’t work on, the only other choice is the XA25. I absolutely prefer/need a sweeter tube preamp on the XA25 to balance it out for my taste.
I am unique in that I don’t like aggressive or bright systems. Maybe my ears bother me so SIT3, E2se and XA25 in that order.
Proper balance between speakers, amp, preamp and source is important to give me an overall softer/sweeter sound. Many might disagree with me.
If you can live with 12/20wpc for 8/4ohms, don’t hesitate to get the Valvet E2. Whether it’s the E2 or E2se version, both awesome amps. The SE is a little more open and cleaner with a little more depth.