I've probably used almost every speedloader and ammo pouch on the market over the past several years.
Hume Pack-Six speedloader pouches. Using Safariland Comp I and Comp IIs. I've just never gotten as fast with a Strip as I am with the Safrailands. Ditto for HKS -- that knob just slows me down enough to make a difference in my performance. They hold all six rounds in front of the belt. Not the slimmest design, but surely the most secure, and easiest to pull from aside from the Del Fatti SLC-2. Holster is a Wild Bill's Summer Heat IWB, Belt is made by Tucker -- built like a tank!
Hume Pack-Sixpouches in brown. Cost was nice -- just under 20 a pop. Holster is a Hume 715 IWB and belt is a Tucker.
The Del Fatti SLC-2 is the one in the rear of the photo. In MY experience, simply the best speedloader pouch on the market that I've come across. Also, not cheap at all. Cunningham's unorthodox horizontal pouch (no pic of this one) comes in a close second -- and is half the price of the Del Fatti. Belt scabbard is an Alessi.
The Del Fatti SLC-2 in this photo is open and exposed, showing the plastic retainer rng riveted to the leather that holds the loader in place above and behind the belt. Absolutely the most slimming design I've ever worn. Does not bulge even under a lightweight shirt. His ISP-4 also vanishes into the recess behind my hip (IWB) and even is unobtrusive in crossdraw in summer weight clothing.
Other designs I have used... DeSantis A30 Split-Six that straddles the belt. Not so good with Safarilands, but just dandy with HKS. The 2x2x2 or 3x3 slide pouches are alright and can be worked up to a fairly fast speed, but you're still slower than ANY loader and in the same league (almost) as with strips. The dump pouches without strips are misery. My fingers just cannot juggle all six cartridges and load at once. cartidge loops on a belt slide are alright and flat, but you'll be doing the old 2x2x2 routine. Mernickle makes a solid loader pouch but it places the entire loader (like the HUme) in front of the belt. The cheap nylon pouches don't appeal to me.
I've not had a Safariland dump rounds in my pocket or drop them in the field. Had it happen once with an HKS -- probably got hun up on keys in same pocket. The old Dade models were known to spill their loads. Not an entirely pleasant scenario to imagine or experience. Best bet if carrying loaders in a pocket -- keep the loaders in their own d----d pocket and then you're almost sure to be fine.