As stated above the only difference is when you engage the leash - either ejecting or unhooking.
Technically I suppose you get more depower (further shortening) of the front lines with the Free Ride bar as more line is pulled through though I find the Fusion depowers more than enough. I suppose in a major storm/gust or some situation in which you want maximal depower this may have a slight advantage over the fusion though the kites roll over onto their backs so well there is almost no pull.
The benefit to the Fusion is that the leash activates on the “mini fifth line” so the regular trim lines are not engaged and pulled all the way through. I find this much easier to sort out if you drop the bar while unhooked - simply hook back in the kite is ready to go just as it was before. Also the “mini fifth” takes no load when riding so really is only under strain when you are on the leash - so I find it doesn’t wear much and I imagine less prone to breakage from weak spots than the center trim lines.
Basically I recommend the Fusion if you unhook - its more than enough depower and much less fuss to get riding again. Other wise it’s pretty much a tie I guess.