I like Sengoku 3, i don't really enjoy 1 and 2 anymore (and 3 its the only one I don't have on a real cart, of course, make sense). Sengoku 3 feels more like a traditional beat em up to me (enemies have lifebars, better hit detection etc) compared to 1 and 2.
1 especially is really hard for me to play again nowadays. Another thing I enjoy in Sengoku 3 is the combo system, you can keep the count going kinda like in a cave shmup, it's fun!