Flat versus conical burrs can matter, but first decide whether you want a hopper, weighed single doses, or easy switching between beans. Beginners should care more about whether the grinder can grind fine enough, adjust predictably, fit the counter, avoid too much mess, and match the way coffee is dosed.
The Encore ESP is the hopper-and-cup option here. It uses an on/off knob or pulse button rather than a built-in scale, and its manual describes using the dosing cup with 54mm or 58mm portafilters. That suits beginner milk-drink use: lattes, cappuccinos, flat whites, cortados, Americanos, and medium or darker roasts where repeatability matters more than constant bean swapping.
The DF54 and DF64 are single-dose grinders. Single dosing means you weigh the beans first, load only that dose, grind it, and use bellows or a low-retention design to reduce leftover grounds. This is helpful for decaf, rotating beans, and keeping doses consistent. It is less helpful if you want to press a timed button half-awake and avoid scales.
If you specifically want timed, pre-programmed, or weight-based grinding, do not assume these three picks solve that just because they are good espresso grinders. Pick a grinder advertised around that dosing feature, or accept doing the steps yourself: weigh beans, grind, dose, and pull the shot.