While I myself would choose Loki if I "could only have one", there is an odd reason that Aerotech could be more cost effective in the long run......sales, blowouts, and people selling off their stock when/if they leave the hobby. The fact is that Aerotech has a much larger market share than Loki. Which means that dealers may often run sales of overstock, or they can afford to have seasonal/promotional sales now and then, and sometimes they either go out of business or scale back which may mean a big blowout. And then there are the folks who inevitably stock up way too much, and at some point are either forced to sell of some of their stash, or they leave or take a break from the hobby....which again leads to some killer deals to be had. This applies to hardware and reloads by the way. If you are smart about it, you could fly Aerotech all the time and never pay retail. (there are perhaps reasons that this is not the best way to go about things "for the hobby", but that's another discussion).
If you go strictly by retail pricing (including hazmat/shipping), I'm not sure there's that much of a difference in the long run. But if you shop sales and blowouts, you will find way more Aerotech offerings over time. Not that you can't find some sweet/smoking deals on Loki stuff if you are patient and ready, but it's a fact that they don't come by nearly as often.
Again though.....if the monetary factor was equal, I myself would choose Loki most every time. Love their product, GREAT stuff, and I like doing business with them. Nothing wrong with giving Aerotech your dollars mind you...they's good folk too, and they definitely make a quality product. It's all good.
s6