The newer version LG UltraGear 38WN95C has locked 144Hz so no OC Hz and software G-Sync Compatible (Display Adaptive Sync) (VRR) same software Freesync equivalent. .....sure has HDR 600 (10-bit) but it's a huge trade off .. . The LG UltraGear 38GL950G-B has HDR 400 which is 8-bit+FRC HDR can simulate HDR10 content..
If you're looking for a real G-Sync monitor go with UltraGear 38GL950G-B monitor .. .
If you don't care about software G-Sync Compatible and OC Hz passed 144Hz go with the UltraGear 38WN95C version ..
The LG UltraGear 38WN95C is also $500. Cheaper
144Hz to 175Hz means nothing in real world terms... 99% of users wont notice, and the other 1% will only convince themselves they do. That alone is a crazy reason to choose one monitor over the other. If high refresh is a PRIORITY feature, then either of these is a daft monitor purchase for anyone.
HDR-600 vs HDR-400 can make a significant difference, so the trade off there is FAR more significant and noticeable than the aforementioned refresh rate difference.
The 38GL950G MAY offer superior VRR performance, but this remains to be seen, and won't be known until both monitors have been properly and professionally reviewed.
Where are you seeing a $500 price difference? No prices have been announced for the 38WN95C. Please don't assume the lack of a G-Sync module means this will be the case. I think it could come in a tiny bit less, but not that much.