What is the current thinking on the best type and brand of flooring for class C family rooms

I'll agree with concrete.

Commercial porcelain tile where if over a wood base a Schluter ditra membrane. Very labour intensive to install where after installation will last a long time as not effected by a lit cigarette or a pet sneaked in. For the class of rental unit once installed then easily move up to higher class. If anyone goes to commercial building they only flooring that looks great along with lasts a very long time. Unlike ceramic tile where porcelain can be used outside as below freezing temperatures porcelain tile will not crack or chip. It can be a DIY installation where can view some videos on You Tube on how install a Schluter ditra membrane along with using good quality wet saw to cut tiles. A move out then a quick mopping then can rent ASAP. Seen many rental housing provider buy the cheap laminate then it is forever ending up in landfills every two or three years. If the tenants do not like porcelain flooring then they put a rug or carpet where if destroyed then it is theirs. Like everything the cost of flooring will go up where a long lasting flooring is just needs to grouted.

I’m still using the Allure from Home Depot. They still have it. They did reduce the number of colors. I’m still getting the grip strip type.

they did change it a little but, it is a little more thin feeling and more flexible feeling, but still works well.

For the concrete flooring, what is the cost of installation per sq foot. Also, is there a concern with animal odors due to concretes tendancy to absorb odors?

I believe they are talking about existing concrete. As in don't put additional coverings on it. Slab house and all that.

I would definitely seal the concrete though. Maybe use an epoxy paint. Try not to make it look like a garage floor. You want the tenants to be happy and the floor to be durable.