Is Signal still more secure when compared to WhatsApp and Telegram?

I have recently been reading several articles about Signal and (suposedly) how secure it is next to other well-known apps like WhatsApp and Telegram, both of which are claimed to be less private due to both using external servers. I saw here that Signal apparently uses the same protocols as WhatsApp, which does not fill me with confidence due to it’s use in WhatsApp, and only blurs the picture more for me.

Is Signal still more secure compared to WhatsApp?

EDIT: It has been highlighted to me that there is a very similar question about WhatsApp and Signal from 2016, but it has not been updated since 2016, So unless the information in that answer is still accurate (which I’m not sure is the case) I’m going to keep my question open.