OK i will buck the trend.
I use x3 or x4 in my garden.
But as high as my scooes go for hft.
I started off on 8 then up to 10 after a few months and now i stick to 12 as i don't find any real disadvantage from using 12 over 10 everything is blurred from 13 yards down you just need to know your mill dots.
But on 12 my 40, 45 and beyond yard shots are better.
I use scope maximisers on most of my hft guns and have spent ages changing scope heights and adjustable butt stocks so i don't think parallax is too much of a problem for me.