Cant speak to “best” as my Klos is the only woven fabric composite uke I’ve played, but I love it! Great sound and feel.
Were I buying today I’d look at the Synergy ukes - they have a full range of sizes (Klos is tenor only last I looked) and very good prices - I think they’re about the same or less than Klos before taking into account exchange rate and Black Friday discount.
If I preferred soprano and wasn’t in a hurry I’d check out Antico Ukeleleria (not carbon fiber, but the same process with bio-composite & woven fabric)
For travel you may want to aim smaller. I’ve left the Klos behind because of bulk. My flight soprano isn’t as tough, but it’s tough enough for me, fits better in a pack, and is inexpensive enough I won’t stress about it getting lost or stolen