Hiya mate, ok, I've owned a few JY's and one Irontec. Both fantastic brands that you wont go wrong with but at the end of the day, I currently own 3 JY's and a WM, so theres a hint
Personally, I agree 100% with Shamus on this, JY wins out for me purely because I happen to think they make the prettiest faces, heres the last lady to join me from Lucid;
https://www.lucidtoys.com/products/neodoll-sugar-babe-leilani-realistic-sex-doll_160861
Ami, she's a stunner, originally bought as a new body for Suzy, but she's such a cutey she kept her chassis (Suzy is still queen bee though!).
I have already got my eye on a new JY, again from Lucid, but have a few pesky "bills" to pay before I can spoil myself/Suzy
Gel boobs are definately my fave (of my 4 girls I have 1 x E cup solid, 1 x E cup hollow, 1 x D cup gel, and 1 x Ludicrous cup gel filled). Gel filled are lovely, and though I'm aware of the potential issues with them long term, have had no problems yet.
For me personally, JY do feel slightly more cuddly and soft than my irontec, but my irontec was a few years back and I appreciate the industry seems to be moving at lightspeed regarding TPE mixes.
To be fair, you're stuck between 2 great manufacturers, I don't think you'de be dissapointed with either, but personally, i'd lean towards JY.