Howdy 1860!
I'm glad you can get Swiss powder from a reliable source. In 30+ years of BP shooting, I've never SEEN a can of Swiss sold by any of the suppliers around here. (Keyword - SEEN) 'Course, it HAS been available by shipment from distributors and I certainly haven't seen EVERY local source, but it ain't common here. Thanks to new insurance and County regs. (no doubt trying to limit shooters in any way possible) I have only 1 source locally and it's nearly 1/2 hour away. Waldron, In. is also about 45 min. from me and has reasonable prices ... but that's another story.
Well - my point. Are you wanting Swiss for Cowboy (CAS) purposes or BPCR? If only for CAS, save yer $$$s and go with GOEX. You'll be able to get/afford more shootin' that way. If ya have a Ruger Old Army and are planning to hunt, 'tho, I'd go with the Swiss 3F, like DD recommends for power's sake. 2F Swiss for BPCR use.
From what I've heard, Swiss is probably more like what used to be available. I've read numerous folks' articles who've dissected old rounds leftover from 100+ years ago, and, as I recall, MOST had what appeared to be about 2F granulation powder and many (most) were pushin' a conical bullet, not a ball. I mention this ONLY FYI, as you'll likely be shootin' a roundball. Go cheap, IMHO.
By all means, buy Swiss if that turns yer crank and makes you have the maximum
FUN!!! That's what's MOST important!
Yer mileage may vary