We have implemented one each recently, so not a lot of experience.
ScanForce was selected for Remote Sales (truck delivery of food products) - good fit, price, service, support.
Scanco was selected for warehouse automation with ACS multi-bin (2 shipping locations with boxed and palletized goods via StarShip) - good fit, price, service, support.
Each is east coast and is challenged to support west coast clients because of time zones.
Ditto to Karen's comments about Ron C. availability for ACS MB - he knows his stuff but don't expect immediate support which is when you will need it. Multi-bin is wide and deep and can be quirky and none of the ONE knows thoroughly the throughput from Scanco - Sage - MB - StarShip. CAUTION: ONE pricing is woefully understated for training. Unless the client is thoroughly versed in the software, expect that you will be reeled in and you'd be well advised to price your services up front. Scope, scope, and scope some more. Then, test, test, and test some more. In both cases, you'll be dealing with users you've probably never met, ie. warehouse pickers, packers, and shippers. Or remote salespeople. Ask about development time. In both cases, custom programming was warranted - 6-8 week lead time!
Ditto to prior comments regarding technology differences and appropriateness for the problem you're trying to solve.
Bottom line - don't expect to sub it all out to one or the other. You will be the throat to choke.