Which is the most reliable stock broker for a long term investor?

Only low charges don't matter. Sure, they need to be competitive but all other factors like security, interface, customer support, convenience & everything else also matters.

Here's my stance:

- Zerodha in my experience has been good until now. They allow TOTP, the most accessible & secure method that exists to secure accounts (which hardly any Indian consumer facing company gives). I like the customer support because they've always been prompt & solve the problem ASAP. The charges are competitive & transparent. I've heard of the crashes during rush hours but haven't yet faced them personally, again, because I'm not using it to trade but invest.

- I've used Angel One & found them to be trash. The interface is from 2010, account security doesn't exist (they simply allow login using JUST AN OTP) which no sane person would consider secure. Customer Support is sub-par & only likes to delay the resolution.

- Paytm Money, one of the most garbage companies I've come across. In the name of account security, they want all your life's data. This is expected from garbage companies that don't prioritize desktop users because mobile app gives them more data. Charges are random (like the one they recently introduced for everyone as "annual plan"). I personally wouldn't ever even come near them to deal with my money. Quality customer support is non existent.

- I haven't used Groww but again, I'd stay at a distance because of the product standards I like to use. It again is a company that prioritises mobile users & they don't even allow creating an account on the web. Data hungry Indian companies like these are those I'd never come close to because it shows the values & ethics they may have to an extent. Everything for them is about the app, data & every user is just a number, not a customer.

You might like the one you use & have a different opinion from mine.

Which one do you use & why?