I've only done the postal/telephone dating thing, though I suppose there's not a lot of difference apart from the time it takes to send/receive messages.
I found it a double-edged sword. It was good to just get on with looking for a partner so directly, and much easier than throwing myself into crowds of people in realtime. It was fun (and useful) to look through the lists and think about what kind of partner I wanted, and what traits I needed to avoid. For example, I was able to ward off all the oversexualised types by just writing it in my profile that I wanted a demure but colourful dresser.
I got 3 girlfriends from it, and they weren't particularly worse than any of the women I met by more conventional means. I think that the awareness that we'd met via a dating thing was sometimes difficult for the women to cope with, at least in the early stages. I suspect that it's this "strength and commitment test" that so many ladies find they have to subject guys to......they don't get that from these situations because they have to pretty much admit that they're interested in a relationship with whoever, and the guys don't have to demonstrate much courage. So I used to hear a lot of "retractions" like "I don't want a relationship" or "I only joined for a dare, my sister sent it off before I could stop her." The latter wasn't a problem, but when you're wooing somebody who says they don't want a relationship, that can be spooky because you have to go along with it although you don't really believe it. I was really caught out once when I was getting wonderfully close to one such lady who then revealed that she'd had a sexual partner all along. There wasn't much I could say......I had to explain to her that whatever we had was probably not fair on her partner, and she just countered with "why? It's only a special friendship we've got." I bowed out as gracefully as I could but she was furious.
In some ways the realtime method helps because people seem able to sniff out the ones who aren't ready for a relationship, whereas anybody can join an arranged dating thing. So it's a natural haven for people with lousy interpersonal skills.
I benefitted as an Aspie from it because I was able to do a lot of my wooing via the written word, and the women concerned nearly always seemed to appreciate what I wrote for them. They were able to know a lot more about me than I could have told them by the spoken word.
So yes, I'd say it's worth a dabble. Just make sure you know the pros and cons of the method and you should be fine.