Value is in the eye of the beholder. It's like asking "What's the best...".

I'm going back to latex tubes after a stint with light butyl, with the caveat that I primarily race on tubulars. These are for training and some racing, like when I have to fly to the venue. They do ride much nicer than butyl at a given pressure. They will compliment the wide wheels and tires nicely. FYI Ribble has Vittoria 25mm RVC latex tubes on sale for $8.66 each. I just bought a half dozen.

The main reason I switched was that I could not find latex tubes with long stems or RVC at the time, so I bought a case of butyl which lasted quite a while.