Would prefer Thermoplastic (blue) as it's supposed to be improved design over OEM. Not trying to use poly bushings as they require regular greasing / tend to squeak.
OEM is rubber, they will squeak.
Not arguing but just to say I put mine in place in 2002, I have never needed to grease them since installing, I greased them then by hand then at install as an aid to install/adjust.
I put a Hellwig 1-1/8" rear bar on my '07 F-150, poly bushings, and poly bushed end links too with a dab of grease rubbed on so I could slide into position easier.
Never have I heard a squeak. The Mercury has been through SW deserts, heard grit in the windows but never a sway bar squeak.
I know that some sway bars come with grease fittings in the straps, but I've never seen need of them.
My '77 F-150 has 14 pieces of red polyurethane bushings installed in the '80s, never a squeak there either.
Yeah, I tend to keep them awhile.