Just remember Soda blasting will only remove paint, so not rust/bog etc..
Great for things where you dont want any damage.
eg: Things like brake callipers you can actually soda blast with rubber brake seals left in and they wont be affected.
Sand blasting is much more abrasive and will remove rust, bog, thin rusted metal etc. While Soda is far less abrasive and will only remove paint. So really you may use both methods where needed.
The benifit of Soda over Sand i think is with Sand blasting it gets everywhere and doesnt dissolve. So you'll always have bits of sand in crevices, and hard to get at places no matter ho hard you try to get it out. While Soda blasting dissolves and you dont get this problem.