best song is a toughie. best by decade might be easier, but still very difficult.
however, if i go way back, more than 30 years (wow) i have a tune that has always been very dear to my heart. i can still remember the day i wrote it quite clearly. i still lived at home with mom & dad and had a twin bed in my room. i was sitting on the end of the bed with my amp pointed right at my head, straight away. that's where i wrote the song. i wrote a number of tunes in that small bedroom.
anyway, keep in mind the year was 1985, and we were in the height of the cold war. me, being raised up in a Pentecostal church, had lived my entire life hearing about Armageddon, the rapture, the inevitable doom of humanity, etc... and at the time i believed there would be a nuclear holocaust, i would never marry, have a family, or a chance at a normal life.
fast forward a few years and my view on the hopelessness of mankind had changed a bit, but anyway, at the time, the emotions and fears were quite real to me.
so this song is about just that, the fear of nuclear holocaust. its titled Sleeping with A Giant.
i still to this day, play it, albeit, more mellow, slowly and on acoustic.
i'd categorize it as 80s power pop, and i think it still holds up.
keep in mind the year it was recorded was 1987 and i think we spent about $2000 on the recording project. that was a bunch of dough back then, but it only bought us 1 day in a studio with an engineer. we managed 6 songs that day.
https://www.reverbnation.com/therayn/song/1822850-sleeping-with-giant-ep-return-to