I was the BTC run (speed) coach for several seasons. Great club, lowest price of entry, very good people of all levels. I think the current run coach is pro John Hirsch, who’s an excellent coach and a personal friend.
Empire Tri club is another excellent club, and if you want something bigger and more organized (high price but you get more) that could be an option. I currently coach for them and helped start that club many years back
But really the club choice first and foremost depends on where you live and where you want to train.
Manhattan clubs tend to train in CP during the week.
BK clubs train in Prospect Park.
All of the clubs will do long rides up 9w on the weekends and many of the top clubs will also do OWS out at Coney --Empire typically has around 100 people out in wetsuits, has coaches, lifeguards, etc. to get that OWS time.
Most of the clubs figure out some way to get coordinated access to local pools.
Happy to chat more if you want to PM me, though I’m not on ST nearly as much as onceuponatime.