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

I will have to say that the Sophia Royal Princess 300-B's did sound the best in my BorderPatrol S20 SET amp.  However I really was taken aback with reliability issues about 5+ years ago with that tube, and challenges with getting them to replace them.  I still have personal issues with spending $2400/quad for those (I have no idea of what they cost now) and their not being reliable.  I presently am on my last-set of  Princess Mesh-Plate 300-B's which sound good and am looking forward to the LinLai tubes.  
I used to tube-roll years ago, however I guess in my older-age, I like just settling down to listening rather than trying to squeeze the last bit of sound improvement, especially at the price of some of these 300-B's !  

@peterh_nz  Peter, can you share more about your Woo Audio WA5-LE headphone amplifier? Woo Audio in general? Which headphones are you driving? Thanks.

Copying the link below, should the Agon 300B aficionados want to comment. I'm evaluating headphone amps and your feedback will be valuable. Thanks.

@charles1dad  thoughts on the Mundorf caps upgrade? : ) 

https://wooaudio.com/amplifiers/wa5le

I have Canary Grand Reference 300B mono amps.  There are 16 300B tubes.  When I purchased the amps, I purchased Golden Lion tubes.  In talking with Canary they stated the biggest game changer for sound in their amps is not power cords, fuses etc, but WE 300B tubes.  In my case that would cost me $12k for 16.  I would love to swap out the Golden Lion tubes but that is a steep price to pay.  Anyone have any suggestions?  

David, 
The Woo Audio 300b amplifiers have been  well regarded for quite some for both sound quality and built quality. Mundorfs are very well regarded. I have to believe that those higher quality coupling capacitors and power supply capacitors would make a worthwhile sonic improvement. I can't speak precisely  to how reasonable the upgrade cost is but probably good when considering the parts involved and the professional labor.
Charles 

Thanks, Charles. Let's see where the journey for a headphone amp leads. Woo Audio (several options) is on the list. Viva Egoista 845 or 2A3 is as well.