http://www.condoroutdoor.com/ma55triple_kangaroo_mag_pouch.aspx
http://www.bing.com/shopping/search?q=Condor+Triple+Kangaroo+mag+pouch&FORM=HURE
Condor brand formerly had a strictly airsoft rep, but the current models are pretty sturdy and are actually sold to troops (for real-world use ) in many on-base Military Clothing Stores.
It's a fairly decent pouch for not much money and you can run it on a belt with the 6 x MOLLE straps on the back of the triple pouch. The pistol mag pouch will easily hold any double-stack 9mm mag (Beretta M92) or a single stack (1911). Alternatively, they can hold a multitool or pocketknife. The pistol magazine flap can be tucked behind the magazine if you want to go "open-top" and there is a good friction fit (even for single stack mags).
If you don't like the bungee retention on the 5.56 pouches, you can untie/remove them. Your 5.56 mags will stay in place as they also have a fairly snug friction fit.
Comes in a lot of solid colors and camo patterns.
I've got one and I'm satisfied with it for actual hard use. Price varies by vendor, but call it ~ $16 (Double) to ~$23 (Triple) plus shipping.
THEY MAKE THE SAME KANGAROO POUCH IN SINGLE, DOUBLE, AND TRIPLE CONFIGURATION.
You stated that you wanted a double for pistol and rifle, but I'd suggest that the triple gives you a place to put your ready mags when you need to download your firearms on the range. Or to carry additional mags for each caliber (if needed).
As to the two you linked... 5.11 gear is fairly decent (as is Boyt); either should work well for you. None of this gear (Condor, Boyt, or 5.11) should be considered in the same league as top-end stuff from Paraclete, Eagle, SOE, Blue Force Gear, Tactical Tailor, HSGI, Mayflower, ATS, etc., but they do sell functional gear at a reasonable price.
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