which 300b tube sounds the best?

They are a drop-in replacement for standard 300Bs. I've used them to good effect in two amps designed for regular 300Bs, as well as in an amp specifically designed for them. I don't know if they will give you more body and warmth, though. The differences I heard were greater linearity, better dynamics and extension as well as a cleaner overall sound. In one case I compared them to WEs and Sophia meshies, in the other to EH.

If I was looking for more body and warmth (which to me says "midrange bloom") I might look in another direction. OTOH, I's suggest you try a pair of KRs anyway, because their other characteristics are so appealing it might turn out that's what you've actually been looking for.

S23chang,
I have only compared the 98-C to the regular Valve Art 300B, it was a huge improvement smoother with more detail, and the Western Electric, pretty much even, I would say the 98-C had a bit more resolution and the WE more body and warmth. The differences between the WE and 98-C would best be described a subtle, at least to my untrained ears. Hope that helps.

I bought the jj meshplates based on the positive review from enjoythemusic, plus the price was right. I used them for about 2 yrs. When I did a little tweaking I decided to put the tubes which came with the unit back in, and was amazed at the improvement. The tubes were A V V T 300BSL's. I did a google search to find any info. and found an enjoythemusic update here- www.enjoythemusic.com/magazine/equipment/0503/ a v v t300bsl.htm I agree with the review, but feel the difference was even greater. It is possible that the meshplates age fast, like a lot of chinese tubes tend to do. The new generation of meshplate tubes may be better also.

Which 300B is the best buy?