I used HKS for years... and if I am using speedloaders, that is my go-to. I picked up some speedstrips (Tuff, I believe), but not something that I like.
Now, I converted my 642-1 to 9mm. Now, doing S&W moon clips. Very happy with them, as .38s in HKS speedloaders are a lot longer than 9mm in moon clips.
I am debating converting my 629-1 over to moon clips... but unsure. I like them, but the costs of the machining and then a BMT loader (I only use them with moon clips) is a lot more than just dealing with HKS speedloaders.
I may do a R8 or something similar... which I'll probably get a few speedloaders and moon clips/loader.