Why would it be pinned? The TS has a 16.1" barrel, so the flash hider should just be screwed on (unless there's some weird regulation in your state).
If it's not pinned, removal is simply a case of using an armorers wrench to unscrew the old one - it's on there tight so you need to secure the gun, preferably with something like a Geissele reaction rod rather than a vice block to avoid stress on the upper, but a vice block or clamping the barrel in a pipe vice will work (use something like leather in there to avoid marring it). You'll need a new crush washer to fit the new flash hider, throw the old one away.
Don't know either of those flash hiders but a couple of things to note; generally the recoil is so light on a 223 AR that IMO the perceived recoil difference between different compensators is close to zero, so don't let that impact your decision. There can however be a large difference in the barrel flash and perceived noise, if you care about either of those things. For me it comes down to how it looks, how loud it is from behind the weapon, and the price. Just some things to think about.
