Jeans needle, 90/14 is common for denim, depending on the thread you are using. ( if the thread is really heavy you might want bigger yet.
as for brand— common brands we use are Schmetz ( been around for ages) and Organ seems to be becoming popular. I’ve had a few Organ brand needles sent free with orders from a couple shops. When I’m buying needles I purchase Schmetz- just because I’ve used them for so many years. Singers have their own needles.