There ARE a few Hankook sizes which have the same revs/mile spec as some of the taller 15" sizes, but no white letters or such. There's one 17" size that would probably be a great replacement for my P225/70R-15s on the Camaro and probably at similar prices.
The current Radial TAs are improved from the earlier ones, specifically in the wedge that is at the sidewall's bead area. Rubber compounds have evolved a bit, too, but not into the "energy conserving" later compounds, I suspect. BUT many of the 17" sizes have tread that is not nearly as deep as the 15" treads, like 8/32" for the 17s and 11/32" for the 15" tires. BTAIM
To me, the BFG Radial TA is probably the best blend of performance, durability, and looks of any available radial tire with white letters. Not only from my experiences, but the experiences of many friends who bought them, over the last 20+ years. Your experiences might vary. Wish I could find something like that in a whitewall!
By observation, as times progress, availability of good quality 15" (much less 14"!!!) tires is diminishing. Which is why I've been looking at alternatives, including whitewall alternatives. But to me, one consideration is to NOT have the "Hot Wheels" look, where the wheels are much bigger than what the vehicle originally came with, diameter-wise. But that's just me.
Your money, your car, your decision.
Enjoy!
CBODY67