(Your opinion of whether Google or Telegram is better will likely also depend upon whether you think malice or incompetence is a bigger threat. Google's business model relies upon it snooping on you, but they have really, really good security people ensuring that nobody else snoops on you. Meanwhile Telegram has less of incentive to actively violate your privacy, but they may let other parties violate your privacy by passively fucking up their engineering. They've done stuff like roll their own crypto algorithms, which is a terrible no-no for anyone that cares about security.)