I missed this the first time round.
I've only seen a couple of pairs of Viberg boots, but they look a lot more solid than Redwings. I haven't seen the Munson boot, so I don't know if that's any better made than the rest of the range, but personally would go with the Viberg Service Boot. Particularly if the price is similar for both.
The Aero boots are made by William Lennon. Lennon boots feel much more solid than Redwings, are cheaper in the UK, and can be ordered from the factory with Vibram soles instead of leather and hobnails. Oh, and they're all made on 100 year old machines. I think that some of the detailing isn't as nice as on Redwings since they're actual work boots, not fashion goods, but the leather feels better and they look a lot more durable.
If you're into old school service boots, then Lennon sell the B5 Replica Boot.
There are a couple of threads on William Lennon on the board. Most people seem happy, and I've got a pair on order.