Can lights or LED wafer?

New construction build in North Dakota, going to have recessed lights in all the common areas so we are wondering if we should go with the traditional cans that we screw an LED bulb into or the LED wafers?

If you're on team wafers, which brand do you recommend?

Additionally I've seen different specs for recessed light spacing we have an 18x39 ft living/dining/kitchen and 9 ft ceilings. I've seen that you should do lights spaced half the ceiling height but that seems like a lot of lights to me. What are spacing recs? Obviously the floor plan has to be considered but just in a big room like that what should the spacing be?