Oh yes, Stohlquist is the best I ever got with Stears Infant being the second. If you want comfort and buoyancy, Stohlquist is the best, otherwise, if you want head support go for Stearns.
Well, it's quite an old thread and the information here is very old. Now, there are plenty of modern toddler life vests that can do plenty of work at once like giving their neck foam support, some even protect them from the sun, and keeping them safe within so they don't get out while wriggling...
I think Onyx MoveVent Dynamic can be a great option. It has comfort and is mobile so can serve the purpose.
Source - https://lifejacketexpert.com/best-life-jackets-for-sailing
The red flag you see off the bow is a sign that firewire is present. Mostly, big ships have these flags. A firewire is useful to pull the ship away from the harbor in case something goes wrong like a fire on the ship. It ensures that other ships on the harbor don't get burned out, etc.