Spaceclaim is an amazing piece of software.
No worry about constraints.
Solidworks can be more useful for detail design.
Geomagic design is more suitable for reverse engineering from scan data.
I won't recommend solidworks for reverse engineering from scanned data ,though it does have some tools to assist in reverse engineering from scanned data.
I don't know what Spaceclaim is - SW is suited for design, not for reverse engineering !
Solidworks standards is like spaceclaims, (But for solidworks has many usefull tools you need to buy the higher version like professional and premium)