Although there is a growing consensus that the mesh plate tube design are very appealing, they are not exactly to spec wrt max plate dissipation. This means that some amp design like VAC that operate their 300B at high plate voltage will not be compatible with offerings from Sophia or TJ. I should also note that not everyone likes the WE tube sound. Your best bet is to try if you can before buying. The latest offerings from Valve Art and EH are very good for the money, even if not the cream of the crop.
My current fave: KR or EAT offerings.
My current fave: KR or EAT offerings.