I think you will need to provide a lot more detail to get any valuable opinion here. VeloCloud does have some unique tech that could be considered "better" than Meraki, I suppose, but it really depends on what you are after. I also thought that VeloCloud specializes in multiple connection optimization, but does it replace all the features that a Meraki MX has for security and other features?
I assume you have done your own research on each via the vendor's web sites?
Do you have any existing investment with either product yet? Is your WAN infrastructure determined?
Can you describe your topology and most importantly-- what you are wanting/needing to accomplish?
- Ex community all-star (⌐⊙_⊙)