I agree completely about the RSA jack and i've been pretty vocal about it, its magnetic, its tin, its plastic, it has little by way of strain relief and it puts stress on the cable, i'm disappointed it has gained traction, only TRRS is worse...
mini 4 pin XLR, Hirose (not the same as lemo) and Lemo are my favorites, but realistically mini XLR would be more readily picked up as a standard I think. I favor lemo, as its very robust, locking but disengages easily, attractive, has excellent dielectric properties (insulator is peek, better than teflon), is very compact but very robust and has copper/gold pins.
basically it ticks all the boxes except its more expensive than the others, however with enough buying power the price could be pushed down, besides given the cables and headphones these connectors are going on, it seems ridiculous to cheap out on the connector and make it tin.... besides it retails at mouser and digikey for only a couple dollars more than the oyaide mini that everyone loves and its a better connector in every way. its better than the vast majority of audiophile connectors too, its designed for and used in hispec Mil, Aerospace, particle physics and nuclear medicine instrumentation
BTW thats a Lemo mini BNC as well. this is my DIY project so i'm not advertising. those with keen eyes will notice a N channel and P channel Jfet symbol on my jh13s, diy audio geek to the end =)
but I fear the battle is lost due to saturation, its worse than VHS...
Lemo isnt used by anyone except for myself and as a result a few other DIYers, plus I believe Mark Levinson uses various Lemo connectors on his gear