I normally use 1 min, 5 min and 15 min for intra day trading. 7m or maybe 4m timeframes are potentially a good idea for spitting stuff other people have missed and I normally check my strategy is obvious on more than one chart before opening a position so it’d probably help with that. It’s going to be dependent on your strategy though, if you’re relying on things like support and resistance, you might be better off looking at what everyone else is.