Yes, a bit more 'torque' on the wrists, bur also more supination for the biceps. Anyway as long as I keep training fore-arm wrist complex I don't have a problem with the straight bar. But i know what you mean, some time ago I had very little time to train and as a consecence I stopped training wrists and sometimes got wrist issues when doing straight barbell or preacher curls
This is what i do for fore-arms / wrist:
8 - 6 - 6 reps EZ-bar hammer curl
8 - 6 - 6 reps dumbell hammer curls
3 * 20 reverse cable curl
3 * 20 reverse barbell curl
3 * 30 barbell wrist curls
3 * 30 dumbell wrist curls
I feel that my brachialis need low rep work and the fore-arm flexors need high reps to shred the dense red fibers
Sure, heavy deadlifts and shrugs can greatly improve strength and size of the forearm, but even than you must conside it's the relatively long time under constant tension (holding the weight)that induces the respons....
If your wrist can take it, i would go for the straight bar.