I chose the MHP route because it was more similar to a broody hen, not a glaring 24 hr sun. I kept my 17 littles in a tote for a week because that is what I read about here. I quickly moved them into a 4'X8' plywood-based brooder in the garage because my coop isn't built yet and it's still cold here. I have limited experience but I think many people raising in totes or metal waterers are overheating their chicks and causing issues. I was probably just lucky but I didn't experience poopy butt or any other issue, with chicks shipped from MI to AK.
I won't use a heater in the coop. I keep the garage door open when I'm home, exposing them to 40-55 degree outside temps - they still have their MHP and an oil-filled heater at night. I plan on getting them outside on to thawing ground for a little bit this week to further acclimate them.
I don't have an existing flock, if you do then that adds a whole 'nother level.