Well, don't get me wrong, I had been using the QCY QS1 for cycling and absolutely loved them. They fit flush in the ear so they're comfortable with helmets, there is virtually zero wind noise (which is horrible on many earphones due to the wind catching certain edges of the shell), and the wireless freedom is something I've been waiting decades for. I had no problems with sweat or the occasional rain storm, although I have no clue what their IPX rating is.
My personal reason for switching to the Soundwear is because I value my life much more than other people apparently value my life. I need 100% open situational awareness when cycling on an open road, and I'm willing to trade great sound quality for it. There's just too many crazies out there. I do still use the QCY QS1 for cycling on closed paths (not 1 ear but both ears).
Speaking of which, like you indicated, I did the 1 ear thing while cycling for a long time (going all the way back to Walkman and Discman days). Sadly (and I have no way to prove this), I am convinced that's why I have mild hearing loss in 1 ear moreso than in my other ear.
Anyways, I'll be curious what TW you decide on and how it works out for you while cycling. Keep us posted