I'm looking for a reputable exchange that offers BTC futures with good volume on quarterly/delivery contracts
I currently use bitmex but their delivery contract volume is so low - its highest per 24h is 3-4M$
I'm aware of binance and okex they seem to have good products with high volumes but would like to know if there are more out there?
You can not trust exchanges but you can use metrics, ranks from big sites like Coinmarketcap, Coingecko and find Exchanges with Derivative products like Futures trading. Biggest exchanges can scam too like FTX exchange so with your money, you must be careful.
Futures trading is more risky than Spot trading and it is best for your capital if you don't trade Futures.
By the way, this point can be used to fight against Gary Gensler because it is not logic that SEC. approved Bitcoin Futures ETFs, Ethereum Futures ETFs but they said Bitcoin Spot ETFs are risky for investors. After approving Bitcoin Spot ETFs under pressure, they are repeating same tone of illogical statement on Ethereum Spot ETFs.