It depends in your service area. If your are in an area of good 5G coverage, you will definitely get much faster speeds with 5G. If you are in more rural areas, where 5G coverage may not be as good, then it is possible that 4G will give you better ...
My 2 cents. I have been with Public Mobile since Nov 2016, at the time Public Mobile had the $120/12GB (paid every months), which was a great plan at the time. Since then, and unlike many other competitors, Public Mobile has never increase my price...