I don’t have a scientific interest in planets, but I really like Saturn. It is really pretty with its rings of debris around it and I also like that you can see the rings from a telescope when conditions are good.
I find Titan, which is a moon of Saturn the most interesting. It has a thick atmosphere, lakes made from liquid methane (natural gas), weather systems, rain, snow (of methane, not water). It is a real posibility life could be found here.