For security and privacy, neighter is a good option. If you compare Telegram and Riot, Telegram wins hands down from a UX point of view. Riot is seriously lacking in this department, but it offers true end to end encryption with multiple devices by default, so if that matters to you, that is the best choice.
It all comes down to the author's personal preferences and concerns, but a blanket assertion that WhatsApp is not a good option from a security option is silly. WhatsApp is end-to-end encrypted with the Signal protocol by default, so the security of its message contents is top-notch.
But if the author is especially concerned about collection of metadata they should consider Signal itself, which also has a very well thought-out UX.
> Riot is seriously lacking in this department, but it offers true end to end encryption with multiple devices by default, so if that matters to you, that is the best choice.
You feel more secure is not a good point. This needs to be technical of what kind of encryption feature is used, and not trust on "pappers" of the software creator, or try to feel safe just by using your "spider senses" while using the software.
And remember: You liking or not, WhatsApp is a Facebook developed software.
RING is the only real secure chat software, with DHT, peer-to-peer discovery and encryption.
https://ring.cx/