I've done both. I don't think one is "better" than the other, particularly. I tend to like binaurals, but that's because I've been using them for years and I respond well. The isochronic tones are also fine, but from an aesthetic point of view, they're not as pleasant to listen to (binaurals can be embedded in anything, including music).

One advantage of isochronic tones is you don't need headphones. They're also effective for people who don't respond to the binaurals.

Really, it's whatever works best for you, IMHO. The software I use can do binaural, isochronic, and I think another (monaural, I think). There's a trial version if you want to give it a go: NeuroProgrammer3