Staff notation is important for guitarists, once they have mastered it. The trouble with tab is that it doesn't tell the timing, unless, of course, the proper stave is there as well. It also tells where the author has played it, or thinks it should be played. This is very subjective, unless it's produced by the very same person who played a particular solo that you're trying to get.Many solos/tunes can be played in several different places on the fingerboard - I prefer to  make my own decisions.

If you think you may end up playing in a reading band, or be a session guy, reading dots is probably essential.If, later you want to play another instrument, tab won't help at all - unless it's bass guitar...

If lack of timing marks is not a problem, 'cos you know the tune, why would you use the tab anyway ?

Another problem I find, as a teacher, is that so many downloaded tabs seem to be made by people still wet behind the ears, so are just inaccurate.

On the other hand, so to speak, tab can be invaluable to distinguish things like slurs - is it a bend up, slide up or hammer-on? Not available in standard notation - just shown as 'slur'.Harmonics, etc. Open strings as opposed to fretted - sometimes an important piece of information for the player. So, having both is the best solution, as they complement each other. One on its own is probably not actually sufficient. But that means to get the best out of it, you need to be able to read BOTH !!