LinLai WE 300B or the LinLai Global Elite Permaloy 300B tubes ?

Thanks Guys for enjoying the impressions I've found with the LinLai Permaloy 300-B's.  I'll do another impressions review after I get more than 250-hours on them (like at the 500-hour mark) to let you all know how they sound in my system.  Now I'm in a quandary !  Do I go for the LinLai WE replacement 300-B's or go for the U.S. WE 300-B's ?  The U.S. ones are notably more expensive, however they do have a 5-year warranty on mfg. defect only.  So if one fails, or I guess doesn't meet "spec" they may replace it.  By the way, Sophia only does a 1-year warranty (at least the last time I bought) if you pay the higher price.  Perhaps I'll wait a little while longer to see how these Permaloy's sound and last.  I want to get some of these expensive 300-B tubes before I retire and I'm on a fixed income ! ! !  
By the way, I had thought of purchasing a good tube-tester, so I can keep an eye on my power-tubes.  I may first ask my local audio group if anyone there has one...

@sns,
I honestly believe that you’d be happy with the Lanlai Elite 300b. In regard to tube testing I had my EML XLS tested last week. This pair was purchased new in early (JAN/FEB) 2013 and have been used heavily in my Coincident Frankenstein 300b SET.

@liquidsound, my friend has an Amplitrex tube tester.
Reference scale for transconductance/gm is 90-100= "test like new"
80-89 = "Great" per this particular machine.

My two EMLs tested 83 and 85 respectively. Impressive I thought after over 8 years of heavy usage. Lots of tube life remaining.  Not inexpensive tubes but they last quite a while and have superb sound quality. 
Charles

Indeed Charles, I own the 45's XLS, excellent quality and great sound

http://amplitrex.com/wp-content/uploads/2017/12/at1000_001-1-1024x384.jpg
I can vouch for this device’s ability to test a very broad variety of tube types.
Charles

Yep, that's the tube tester used by my source.