Hello,
as a rule of thumb below 1A output current you can get away with a two inductor or two winding inductor SEPIC. For higher currents a 4 switch buck-boost will always be the better solution.
SEPIC (as well as inverting CUK type ) switches VIN+Vout on its switch node and carries the large du/dt EMI problem. And you switch more current than Iout. That to a much larger Hot loop which includes the SEPIC coupling capacitor. In essence you store the complete transfer energy in the inductive components so those inductors have to be sized that way.
On a 4 switch buck-boost you store only the energy from Vin-Vout times Iout in the inductor, so you get higher efficiency (less losses) and the switch nodes only swing on one side with Vin and the other side with Vout. So you get better efficiency and better EMI in a 4 switch buck boost compared to a SEPIC.
For a small <1A solution that might not matter that much but for any higher current application it will.