Guess my answer would be kind of biased but ihavesolved is a much better laid out site with very little spam and no cliques of members who don't like other members. It's peaceful here.
I have solved is better by far. I stop using blurtit last week because its pretty much a landfill since they got rid of Angela and Rooster as mods.
I only looked at Blurtit once or twice. Never used it.
Good for you!
I am fine on ihavesolved.
As already said, time was and still is too short to look into all the proposed sites, whether blurtit, answermug, etc.
I'll leave the assessments to the experienced insiders.