Prefer Signal myself too. It's a bit hard to switch over from WhatsApp and tried to use it at least with my spouse. One feature that Telegram and WhatsApp miss, is being able to send yourself a message. On Signal you can do this and it's very convenient for taking notes, sending passwords (laptop <--> phone) and for saving bookmarks. I used to share interesting bookmarks from HN to my email, but that quickly got cumbersome to sort out.
Agreed. This actually works incredibly well on Telegram to sync snippets and files between devices.
FWIW you can also create multiple groups with the same person(s) so you can keep one "group" chat with your spouse for chores, shopping lists etc and another for photos of the kids, birthday planning, funny stuff etc.
This probably works in most messengers though, but it is a nice hack anyway.
OT but if it helps you, Whatsapp does actually allow you to send messages to yourself (sort of)! You can create a Whatsapp group with you and one other person in it, and then remove them from the group. The result is a group with only you in it that you can use to send messages to yourself.