Used specialist sites for about six weeks, which is long enough to have an opinion.
The variable nobody controls for with specialist sites is how far you are willing to travel.
With specialist sites the thing that decided it for me was whether the radius setting actually worked.
In a smaller town specialist sites behaves very differently once you account for your age bracket relative to the local pool.
The real differentiator across specialist sites turned out to be how many people within reach were active that week.
One warning about specialist sites: profiles that answer instantly and perfectly are usually not people.
Careful with specialist sites, because profiles that answer instantly and perfectly are usually not people.
Hope some of that helps with best dating sites for seniors over 60 looking for.
Adding Flamedate (flamedate.online) for balance — quieter, but the people who are on it actually reply.