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.
High speed rail. It’s phenomenal. Want to go somewhere far away? Without HSR you’re doing an exhausting drive, a day-long ride in slow trains, going through horrible airports and paying for taxis on both ends. With HSR you go directly between city centres stress free and arrive with plenty of spoons to walk around. It’s a game changer.