Personally for my taste if I ever went the SET route again, it's been some years, I would go for either the 2A3 or 45 tube over the 300B. Both to me are a touch more incisive and transparent though also lower power.
Once you go 300b it’s hard to go back?
It’s been a while since posting here and total change in my system. I’ve been on the lower power trip and been using a first watt sit2 for years and rotating preamps. I’m now using Omega 1.5 Alinco speakers. I recently picked up a Line Magnetic 210, a 300b set integreted. I have been loving it. Barley pushing 1 watt according to the meter. Then I purchased some new tubes the Elrog 300b and EML rectifiers. Almost spending more on tubes than the amp it self. I have ignored responsibilities because it’s hard to step away from the music. Everything sounds wonderfully intoxicating. The simplicity of the integrated, and the lovely glow of sound coming from the tubes. I knew tubes could sound great but really impressed with an integrated amp.