garymansell wrote:VSR is obviously Free and Veeam an additional purchase (presumably for both the master site and the replica site if you want to be able to failback after a failover?)
No, you only need to license the master side with Veeam. So technically, Veeam is also free assuming you are using it for backup already.
As far as the rest, it all depends on your requirements. Veeam is a lot more mature in terms of functionality, but you may not need any of that. I suggest you just run both products side by side to contrast and compare.