tough question. I think almost any medium SAK with a Classic SD is an unstoppable combo.
I have my Stayglow SD on my keychain at all times, then depending on where I am I pair it with one of two SAK's
- at work (office environment) I pair it up with an Alox Pioneer . The Pioneer is slim and fits so will in my work bag. I have scissors in my desk at work so I dont really need them on my pioneer .
or
-On weekends when I hike, mountain bike or am just running errands I like to pair my SD with my Stayglow Climber. I absolutely love the scissors and use them a lot on my days off, and the Stayglow scales are amazing.
In conclusion: I just think an SD and whatever SAK is best for YOU is the best combo!