Alibre Design vs Inventor: Which is best for you?

I'm using Alibre Design Pro for both machining and 3D printing projects, and really enjoy being able to iterate and improve my designs quickly, from concept through to finished product; Alibre is a good tool to have in my toolbox, at an affordable price.

Frequent errors introduced extra lines when mirroring a sketch - hard to clean up. When doing a "save as," it defaults to the last saved file rather than the file it came from, so many drawings end up in unrelated projects/files rather than the project file.

powerful iLogic feature that simplies repetitive tasks

Assemblies always seem difficult, wither mating physicslly or with rules it always seems glitchy and I havent been able to grasp it fully. Despite this I am able to assemble my parts but I can tell the relationships are not full.