I mean I'd love to have the free time to be able sit analyze and strategize against what my competitors are doing, but I'm too busy working on the next place which I believe will add the most value. In the end you'll end up with a different priority/feature-set and USPs that focusing and trying to replicate what your competitors are doing.
IMO the most important thing is to have a solid Customer base, they'll submit an infinite stream of issues/feature requests which will highlight where to focus your efforts on. Although it's also important to have confidence in innovating yourself as my best USPs have come from novel features that no-one has thought to ask for, as you'll pretty much only receive requests for features others have already done.