Elrog 300B vs Takatsuki 300B tubes

Has anyone heard the Elrog 300B tubes ? I read an article which mentioned that the Elrog 300B delivers 15% less power than a traditional 300B tubes. Can anyone confirm that it is audible ?

I am choosing between Elrog and Takatsuki 300B tubes. I would prefer the Elrog because it is cheaper and supposedly wonderful but if it really sounds less powerful then I have to rethink.
When I listen to very dynamic big band jazz the EML XLS really deliver the scale, power and size of the band in all of its glory. It really uncovers the full weight and textures of instruments individually and also as a full ensemble. Yet it does justice to smaller scala music as well. I can't wait to get the Elrog tubes and compare them to the EML.
I have the Takasukis and like them a lot.

I paid for a pair of 'cosmetically challenged' EML 300B XLS tubes directly from Jac Music on Feb 15.--he failed to getting around to shipping the tubes for 11 days after that. He also refused to respond to multiple inquiries from me during this period asking what was going on (his invoice and emails stated tubes would be shipped immediately upon payment). One screw up and excuse after another from Jac; I'm now out the the $ I paid for the tubes plus the cost of shipping regular 300Bs back to him that he sent 'by mistake' and I have no tubes. He promised to send me a pair of non cosmetically challenged 300B XLS tubes at no additional cost if I paid return shipping. Per the shipper the returned tubes have cleared German customs are being held for him because Jac requested his own pickup (Jac claims the tubes haven't cleared customs, so either he or the shipper is not being truthful with me).

The tubes may be great but buyer beware.
I bought my EML from TubesUSA.com and the customer service is top notch. I am buying my Elrogs from them also.
I've bought tubes from George at TubesUSA before as well and always
received great service.

I foolishly decided to try and save a few bucks and buy a pair of
'cosmetically challenged' 300B XLS tubes directly from Jac Music; I wasn't
sure re the XLS tubes and so thought I'd dip my toes in the water with the
discounted tubes. Unfortunately, I didn't receive XLS tubes, returned the
regular 300Bs that were shipped to me, but still have no XLS tubes as were

So strongly urge USA buyers to purchase through TubesUSA; I am
confident George will take good care of you.