I don’t have a lot of experience with different fondos because I’ve only ridden one, but Gran Fondo New Jersey was awesome. I think Covid killed it unfortunately (canceled again this year) along with the founder passing away (RIP Marty) a few years back. Would regularly get over 2000 riders and could attract some big names: Ivan Basso was a guest rider one year, Vegan Cyclist came and rode. Incredibly well run, aid stations were absolutely amazing, and the routes were stunning. Only downside was the cost of around $180, but it was my hometown ride so I never had to spend money on hotels. Sad to see it gone.