I think I had a HOMM2 demo I played a lot and then got HOMM4 and played that so much with my brother, have since got 3, 5, 6 and maybe 7.
3/4/5 being my favourites for different reasons and have recently got songs of conquest to try and see if it scratches a similar itch whilst still doing some things differently so will hopefully be good.
Will definitely be showing my brother this