For me personally, trams are right up there. Aside from the main issue of sharing the roads instead of having a dedicated line, they really make it easy to get from one part of a city to another, especially for wheelchair users. They’re usually as frequent as buses, but much faster. The stations are much more attractive compared to bus stops (on newer systems), and can really make an area feel much nicer IMO.
For those that have a bike, suburban and inter city rail is a strong second. The speed and ease of last mile mobility is what appeals to me the most. Recently took my bike across the country to my home city and it ended up being much faster than driving (by almost an hour) - the multimodal commute was pretty hefty, but lots of fun nonetheless.
Bike and it’s not close. I’ve loved being on my bike my whole life, ever since it was the easiest way to get to the public library as a youth. My hometown had a beloved, beautiful, and very extensive bike trail system, and in addition to my use of it for transit, my family would ride it together for fun every Sunday. At peak usage as an adult rider, my daily commute was ~27 miles. Currently it’s 9, but I do a lot of errands and shopping and recreational riding as well.
Second place is walking.