I have had both dogs and cats all my life. Presently my family has 4 cats but no dogs. Dogs are high maintenance pets.
There are several products on the market to remove urine smells. Both cats and dogs have "accidents" and they both smell equally bad. Cats usually have them in the litter box, dogs have them everywhere. When cats use anything but the litter box something is usually wrong. Always provide N+1 litter boxes, 'N' being the Number of cats you have. Keep them clean! Remember you don't like to use a filthy facility either. There are even all kinds of automated litter boxes. Some cats have even been trained to use human type facilities.
Both dogs and cats can be kept outside or inside. Cats usually do best inside. Cats can be left alone inside with someone to check on them every 2-3 days for long periods. Dogs require daily checks even if left outside with adequate food and shelter.