I have 3 at the moment and I've ended up using all 3 depending on what I want to achieve. I'll use the megs as the reference point because you have it.
Megs Last Touch Quick Detailer -
My favourite for using as clay lube and on interior plastics.
Out of the 3 this is the lightest, kind of like an enhanced water, if that makes sense.
FinishKare #425 -
Leaves a better finish than the megs.
Slightly thicker and not quite as easy to use as the megs.
The anti static properties are fantastic for keeping dust off the car in the summer months.
SONAX Xtreme Brilliant Shine Detailer - ( I wiped down my new zed with this last weekend so I have some pics) -
The thickest of the three. Hardest to use, verging on a quick wax type product.
Incredible water beading, the best I've seen. Water flies off the paintwork making it great for winter.
Paint protection on par with a wax.
Finish is very shiny but I noticed it doesn't quite make metallic flake pop.