I think the serial number on the Logans ends in an H if they are hardened. Something like that. You can look it up, I think it's in the FAQs at lathe.com.
In theory the v- ways are better but plenty of good work has been done on Atlas flat ways. I am partial to Logan because it's what I have and because that's my son's name, but one with a steady rest and a milling attachment for only $1200 (incredible deal for my area, I don't know about yours) would have me running not walking to buy it if I were in the market. Don't worry about more lantern tool holders as they're frustrating to use anyway. Again, plenty of good work has been done with them, but there's a reason they've been entirely replaced.
BTW, keep in mind that, worst case scenario, non-hardened ways can be re-scraped. Hardened ways cannot. In most cases, at least as far as I've seen, this category of lathe usually hasn't had enough use to wear out the ways. Such examples certainly exist, but they are the exception.
Edit: I hadn't actually looked at the Logan before. It has a steady rest as well. How important is the milling attachment to you? Personally, even though I have a "small" round column mill, there are times I would love to have that on my lathe since the lathe has some indexing ability built-in (by counting bull gear teeth, for instance), so the combination can do some things that require a bit more equipment to do on the mill. But that's a rare use case, so I don't think I would make it the main reason for deciding, but it is a consideration.
Really it seems to me that you're in a very fortunate position to have two strong options available at the same time and at comparable prices. That's a problem to have.
