You are comparing apples with oranges. Blockstream is self custodial node. Coinos is a custodial service account (just an entry in a database).

I am not taking any sides, just commenting your wrong perspective between custodial or not.

Please read this comparison guide https://darth-coin.github.io/wallets/lightning-wallets-comparison-en.html

About Blockstream latency I could say this: their Greenlight servers (where your LN node reside) became quite used by many users and they didn't upgrade the infrastructure.

My advice (even that I know you will ignore it) is this: use multipke LN wallets for each situation to be prepared. And read my guides.