I agree with most on this thread that getting really good at one method is more effective. BUT, if you like the idea of learning 2 methods, then you need to have 'separable' methods for inspection. I believe you would need to be looking for totally different things. For CFOP it is extremely easy to spot 1/2, 3/4 or a full cross ready made; for Roux it is extremely fast to spot most of a first block ready made, and for corners first methods it is extremely easy to spot 3/4 or a full EG1 face. You could twist the cube around and in 1 second you could instantly identify if any of these three exist and pick the method that you found the easy start. If *none* of those cases exist, things get way harder, and at that point I think the only way forward is to arbitrarily pick your 'best' method and just assume you are using that. There wouldn't be enough time to do detailed inspection on all the methods.