I've never owned a Strider, but I prefer the Ritter Grip to the Endura, Sebenza, XM18 and pretty much every other folding knife I've ever owned.
It's mainly down to the speed and ease of opening and closing the knife - an important consideration when selecting a folder. After many years' research and considerable investment

I have found that I prefer thumb studs to opening holes (of any shape) and Benchmade's Axis Lock over all others.
Axis Lock Benchmades can be reliably opened
and closed even in thick firefighting gloves and lock up securely with zero play.
The Endura is a great knife (I favour my older unlined "3 series" over my Endura 4), but I find that Griptilans feel better in the hand when cutting and are quicker and easier to open and close. I will however choose to carry a 3 series Endura or Pacific Salt if I am expecting the knife to get full of crud or sand, as they are easier to wash out than a Grip - though stripping and reassembling a Grip is fairly easy.
I really like my Seb (a Small Regular), but find I will generally choose to carry a Mini Grip variant over it as I prefer the Axis Lock to a frame lock.
Once again, ease of opening and closing makes me opt for the Benchmade.
I also find the Mini Grip's handle to be more comfortable and secure in use.
Regarding the XM, I find it quite clunky and heavy. The thumb stud rides too close to the forward swell of the handle and I have found that this can nudge my thumb off the stud when opening the knife, especially in gloves.
Also, I find it much easier to Axis-flick a Benchmade to the closed position after use.
I really like the Grips' Noryl GTX scales. They are light, strong, tactile and hardly show any wear. I have never felt the urge to swap them out for custom scales ..though I
really like the CF of my 551-101. :thumbup:
My only minor gripe with the full sized Grip is the thickness of the handle. It take up quite a lot of pocket space and I usually find that, for EDC, I will carry a Mini Grip variant , 94* Osborne or 710.