The central server in Signal does not have the same role as the Telegram's.
If you care first and foremost about UX, use Telegram. If you care first and foremost about the security of your communications, use Signal; go out of your way to use Signal.
If you care first and foremost about UX, use Telegram. If you care first and foremost about the security of your communications, use Signal; go out of your way to use Signal.