I'd go with the latter, the turret form factor. Domes are subject to many issues such as dome becoming foggy when dusts sticks to it after fog, or UV fogging up the plastic or IR reflection into the sensor from the dome. They demand much more periodic cleaning than a turret does.
But both of those 4MP cams will have poor nighttime performance with their small 1/3" sensors which is barely workable for a 2MP camera. Go with at least the larger 1/1.8" sensor for a 4MP camera, which will cost more but will be worth it if you care for good performance at night or in reduced lighting.
View attachment 160806