Tablature in any proper guitar book (including Guitar World etc) are the best for guitar, so why not learn to read that? You only need to learn the easiest part of standard notation -- the note durations.

Standard notations were designed to be playable on every instrument. So if you're not gonna play anything other than an electric guitar, or turning professional, you don't need to bother with it.

I'll admit my sightreading is good for piano and violin but when it comes to guitar, let's just say there're tabs for a good reason. BTW, if you wanna learn standard notations, learning theory is a must.