TCW-3 is really for outboards only, I'm not sure how it became the "universal" 2-stroke oil.
JASO FD is meant for higher RPM, hotter running stuff that changes throttle position and RPM frequently. (i.e.: Your jetski)
The synthetic blend versus full synthetic is up to you. Both will meet the standard. How much they "better" they are likely depends on the marketing department at the individual companies.
I run TCW-3 in my outboard and JASO FD Sea and Snow, Redmax, Stihl, Husqvarna, Echo (whatever is on sale) oil in everything else like my mower, leaf blower, weed whipper, chain saws, brush cutter. I just make sure it has the JASO FD seal on the bottle somewhere and I'm good to go.