A. Tales of Zesteria
B. Trails of Cold Steel
nvm picked up Trails of Cold Steel for fear of the last retail copy in the area disappearing. Tales of Zesteria will have to wait another few months until it's on sale during a PSN sale. I'm actually kind of tempted to sit on ToCS until I finish some of the other games I'm working on in case I change my mind and decide to sell my still-sealed CE for some extra dosh.
Zesty's on Steam so its currently the lowest of low priorities, especially since its kinda jank (or at least more so than your usual Tales of Game), though being familiar with the plot will likely be advisable for any Besty playthroughs since I can't imagine that game's plot not being heavily married to Zesty's MC and plot (or not because lol Tales of Plots).
Cold Steel is honestly, the best choice if you had to play one now, but I can't begrudge you any if you don't since there's like the better part of two dozen JRPGs coming out/out now that you could pick from instead.