I carry a 640-1 in either an ankle holster (inside boot), or in an IWB at 4:00. At home, it’s a 342 in a Mika pocket holster. In all cases my reload is a single six round speed strip in weak side front pocket.
But I’ve also seen folks use a 7 round speed strip loaded 2rd skip one 2rd skip one then 1rd. As well as 8 shot loaded in a 2rd skip one 2rd skip one 2rd configuration
The main difference in the two skip style configurations is your personal training style from what I get by talking to folks that use skip configuration.
If you grab the 7rd strip with 5rd in skip configuration by the wrong end. It throws off your trained 2 in then 2 in then 1 in on reload. You wind up with 1 in then 2 in then 2 in.
When I carry 7r speed strips I've always loaded 2 - 1 - 2. So it works the same from either end, pretty much.
But the "round" speed strips are really handy, and cheap. And they don't interfere with grips.