Line 2 is home to the best view on the whole system: between Castle Frank and Broadview, over the Don Valley is amazing! The tunnel opens up, and the city is spread out under the train. It’s truly amazing and impressive.
Line 2 also has some other interesting features: most stations retain their original tiling which cycles through a set of colours so most stations look unique and all stations share a cohesive look. Islington and Warden have a triple-colour scheme because they were originally terminal stations. (Islington with its white and blue look is nicer, in my opinion).