My understanding is that the R and RT are identical except that the RT has a telecoil, is slightly longer than the R to accommodate the telecoil, and does not have the R’s tap control functionality to start/stop streaming and calls. The L (Life) version is larger than either of them to accommodate the waterproofing, and does not have tap control or a telecoil. The R and RT both use the Ease case, while the L uses a different case because it has no exposed contact points due to waterproofing.
I looked into this recently and decided on the R because I wanted the tap control and was concerned about the size. But now I think the size is a non-issue - I’m new to HAs and didn’t really understand how tiny these things are until I had a pair in my hand. A few extra millimeters would not matter here. And the tap control, while sometimes convenient, is overrated IMHO. I have it on the least sensitive setting, and it still sometimes gets set off by accident when I brush my hair back or adjust my sunglasses. That’s mildly annoying for streaming music, but is a bigger problem when it ends a call. To use it on purpose with that setting, I have to basically hit myself in the side of the head, which probably looks rather odd. If you don’t have long hair or glasses, and don’t often wear a mask or sunglasses, it might work better for you.
