Paul, if you ever envision pulling hard on something side to side, say a stuck fastener, you will find out why I have emphasized a positively locking swivel. Discovered that many years ago with my old Japan Western Auto which lacks such. Sure it has 'two lockdowns' but they aren't always enough since they merely exert pressure/friction between flat surfaces.
Do the Columbian and/or Japan Cman vises have this feature?
Does the rotator have it?
Conversely, if you're not likely to pull that hard on something side to side, it doesn't matter.
Months after I bought my 5.5" reversible, someone posted a clearance on 4" Yost-US machinist vises in the hot deals. This was $90 + ~$25 shpg IIRC. $115 for a new US Yost 204 machinist! MSRP then was $557 and normal price was $350-$450 +shpg! Once-in-a-lifetime deal so I jumped on it though I didn't need it. Oh wait. Scratch that. It's heresy here on GJ.
The Yost is stronger in both materials and design. Also has somewhat better workmanship. Slightly greater throat depth. Single much smaller anvil.
The Wilton is far more versatile and worked night and day better for what I was doing at the time. The anvils took what I consider a decent beating without breaking. And I did find both useful.
Since I already had the Wilton, at it's normal price the Yost would never have been worth it for me.
Aside from supreme bargain prices, if I had it to do over, I would get the same Wilton or maybe the Menard's reversible ahead of a more conventional style before I got anything else. Unless I chose to spend a lot more money on a US Yost 6.5" reversible.
In another post, you wondered as to whether the Menard's rotator is made by the same mfr as the reversible. While I have no way to know, I bet it's not. Jiangsu Swordfish provides (subcontracts?) all or most of the rotators but there is no listing of a reversible shown in these three pages:
http://jsjanyu.en.alibaba.com/productlist.html
I can't know your needs and preferences. Maybe a rotator is better for you. Maybe the Columbian if it's MUSA. Maybe even the Jap Cman.
Good luck in whatever you choose.