Looks half decent to me.
Sneaking around, check, dodgy crouch walk, check, push button to kill, check.
The only difference I see is one is set at night so you can be more stealthy, the other is in the daytime, making stealth a bit harder to avoid a combat situation.
Obviously that short youtube video of play is the entire game and there can't possibly be any stealthy night time missions in the game.
Both appear to play very very similar to each other *shrug*
It's not always a bad thing. Resident evil 2 and 4 for instance and my personal favorites in that series but love them both. I liked splinter cell back in the day and to be fair I really also enjoyed conviction. The new game looks all right, certainly far from bad anyway. If you don't like how certain. Series have evolved then just stop playing them. Not much point crying over it to be honest.