Tempting as it is to choose a larger blade like the K390 Police or my Lefty Millie as one of the options, I think I’d have to go with a pair that have maximum versatility in terms of being able to use them in the most settings.
Even in work environments like warehouses, you can get a lot of work done with a super sharp small knife, and I prefer them for social environments.
Then one of the 3.5”ish blades for any heavier work.
It’s tough to choose from all the great contenders, but at the moment I’d probably go with the K390 Urban and the Gayle Bradley 1.
The Urban is low-key, minimalist design perfection, coupled with outstanding cutting performance.
(This one is a newish replacement I got for my first well used one that I lost at work.)
The GB1 is a stout workhorse for pretty much everything else a knife needs to do - a comfortable, durable tool that is a pleasure to use and sharpen.
Another pair of knives that would be close contenders would be the ZDP-189 Dragonfly and the Cruwear PM2:
The Urban and GB1 pipped them at the post because if I really was limited to two Spydies, I’d want blades with a long sharpening life. If you look at both the GB1 with its hollow grind, and the Urban with its flat ground 3mm stock, down to 0.015” BTE - they would both still be quite thin behind the edge, even with say, half an inch of steel sharpened away over time.