Horses for courses..... as the ECO (Entry Clearance Officer) will not discriminate betwen the fiance or spouse route.
If you conform & comply with the regulations and your proof of relationship is strong, then either way should guarantee success.

FYI ... via a spouse visa, can he work immediately upon arrival in the UK.
Under the fiance route, you'll first have to comply with the visa conditions (ie you get married), then you have to apply for FLR (more money !), and only after approval of the FLR can he work.

Hope this is of help