I had weird artefact noise when using the LD systems IEM. About 2-3 times each rehearsal, enough to ruin any fun. I've not done any further investigation, so I can not evaluate if the reason came from the product or from any other influence factor. But - my Shure and the singer's ANT system, both do not have any of that issues, also no drop outs.
Soundwise - I only did the comparison during rehearsal and ears are easy to be tricked - I guess that with the same headphones it will be hard to notice any difference in terms of noise, dynamics etc. in the context of a band.
To choose on sound units I try to listen to them for a longer period of time. If something bothers me, it`s not mine, it refers especially to the quality of DA converters. I did this test with Shure IEM & headphone some hours listening to HD music and I was happy after. I have not done the same with the ANT system, so I can not rate the system in that.
The features are quite comparable - if the ANT system would have been available at my time of purchase, I might have chosen it.