the UK is so prone to letting a lot of garbage tropical house and deep house succeed. but it's changing. but for now I still think the USA >>> the UK in mainstream music taste.
the UK makes up for this for having superior TV shows.
The UK definitely aligns more with my tastes, though both countries have their positives and negatives.
Because of the higher turnover on the UK charts, some pretty fringe songs have charted well there and the British GP in general seem to be more receptive toward more experimental songs. Like something as out there as Mr. Oizo's Flat Beat or as purely house as Armand van Helden's remix of Professional Widow by Tori Amos would have NEVER hit #1 in the US, but they did in the UK. Electronic music and dance music in general have also tended to chart better in the UK, probably due to the severe backlash toward disco/dance music that the US experienced from the late 70's/early 80's really until the EDM craze of the early 2010's.
That being said, the volatility of the UK charts has also led to a higher number of truly tragic number ones (see: Westlife's entire career).
I'm from the UK and I think the charts here are so rubbish these days. The amount of crap that goes #1 while artists who actually release quality end up flopping .
Not to mention the way they (the UK media/public) let James Arthur go #1 while they blacklisted Alexandra Burke.