I’ve had a (second hand) classic for about 4 years now. Great bit of kit.
Baby Class appears to have no cup warmer (space on top), a small water tank and a small drip tray. On the face of it, none of these are massively important features, but practically they make the whole thing a lot more user friendly.
Warm cups means your espresso tastes better for longer (dumping a shot of hot espresso into a cold cup = cold espresso)
The water tank on my Classic needs filling maybe twice a week (2 drinks/day) you get through a lot of water with cooling flushes, refilling the boiler post steaming etc, plus backflushing.
The drip tray will get 1/3 – 1/2 full from making a couple of drinks. You stand much less chance of slopping mucky water over your kitchen floor if it’s bigger rather than smaller. Backflushing also will fill it right up.
Tampers? Reg Barber.
Grinder? second hand Mazzer
Backflush once a week, descale once a month, hoover the grinder out once a month.