K or K or K or K?
I own all four of the K Brand tenors: 2017 Kamaka HF-3; 2016 Kanile'a 2017 K1-T; Ko'Aloha KTM-00 & 2022 Ko'olau T100
All of the makers have revised their designs and construction processes since mine were made, except perhaps the T100. The newer versions sound different than mine, and in the case of the Ko'Aloha the neck has changed. I understand that the sound of the K1-T & KTM-00 tenors have shifted a little to put more emphasis on the mid and high ends from the ones I have, which are more to the lower end. IMHO I think they have shifted somewhat towards the Kamaka sound.
Keeping this in mind:
I would take the Kamaka-HF-3. I think it is the most balanced and versatile of the four. With High-g Nylon strings it does sound Hawaiian. I use fluorocarbon strings on it. I think give it a more classical and layered voice, especially fingerstyle. Right now it is strung with Pepe Romero UT2 Fluorocarbon Tenor Ukulele Set with LaBella Gold Wound Low-G String. These strings moved the voice more towards the low end and upped the volume. Making strumming it more fun. I think the HF-3 sounds and plays like a design that has been refined for however long the Kamaka tenor has been made—with over 100 years of ukulele making experience behind it. It is a tad harder to play than the others, but that may be just the setup on mine not being as low as the others.
The Ko'olau is a close second. It feels lighter and more resonant that the others. With a more guitar-like sound with fluoro strings.
The Kanile'a has a flatter neck, which I really like. i has a deep, very rich voice. Skewed more low end.
The Ko'Aloha has a fast neck, with a more brash, popular music voice. It's the easiest to play of the four.
Each has a unique voice and signature sound. All are rewarding and fun to play.