well to each his own.
I will say that as far as rodents go, I've owned in the past and present: mice, rats, gerbils, pygmy mice, egyptian spiny mice, hamsters, russian dwarf hamsters, and a giant african pouched rat. Rats are by far the best pet I've ever had, save my giant african pouched rat. the pouched rat is like a giant, more intelligent and more wild version of a domestic rat.
Gerbils- they're fun... don't seem to bite, but they don't interact much with you. Not saying they don't completely interact, but what little mine did was sort of disappointing. I let my two boys have play time daily in a penned off area on the rug, and they'd come up to me to check me out. They were cool (I got one from a breeder, ,and the other was a rescue, the one from a breeder was definitely MUCH more social and ready to accept being handled than the rescue was).
mice- Cool, the ones from good breeders don't bite and will sit in your hand. Although the only time I've ever had one interact with me, and actually groom me annd constantly beg for time out was the one I hand raised as a baby. they seem rather dim compared to rats (but nowhere near as dim as a hamster or gerbil)
Spiny mice- VERY social and intelligent, but not a domestic animal. Also, unless you have had one since day one and it's been handled since birth, then expect a biter. They bite HARD, too! Otherwise, the rewards they give if properly cared for and handled since birth are wonderful. they will come when called, and will groom your fingers and cuddle.
pygmy mice- ACK no.. with these guys, expect a completely nocturnal mouse that you CAN NOT handle AT ALL without it jumping clean out of a 10 gallon tank and completely disappearing on you. They're VERY very tiny, as well. they're about the size of a normal mouse's HEAD!!! basically a strictly tank pet. you can't even keep them in a wire cage....
hamster- many people say horrible things about hamsters, but the ONE that I had, a syrian hairless, was very friendly. he didn't bite, but he flung poo out of his cage (it was hilarious, LOL!). Not the brightest, either.. he would walk right off of your hand, something I was definitely not used to since I've been a rat and mouse owner MANY MANY years before I got a hamster. maybe other hamsters are different, but I know my dwarf's the same way, except he DOES bite and dig at you.
rats- I recommend to anyone and everyone. it's the closest you'll ever get to a dog in the rodent kingdom. I also love them because, I hate dogs but want a constant companion who's extroardinarily intelligent, cuddles, grooms me and begs to be let out of the cage costantly. My first experience with any rodent was with a rat I bought. I wanted a mouse but they only had rats... a few years later I got two female "retired" feeder breeder mice and was severely disappointed. I just can't be without rats anymore..
giant pouched rat- definitely not for everyone, and illegal now anyway thanks to stupid government laws that MAKE NO SENSE. My boy is VERY cuddly, but only to me. he will churble and chirp at anyone else that goes near him. He licks and kisses and loves being scratched and petted. He's also so intelligent, that it's sometimes scary. He can open his cage door, he goes to the bathroom IN THE TOILET!!!!! He's also litter trained for his cage. Matisse knows his name, heck, he even knows to fiddle with the doorknob to get out of the house... I used to take him on a walk on his leash and harness daily (he loves walks... he follows the trails and walks just like a dog would), and one day when I didn't take him out, I caught him on the ledge of the table, reaching out at the doorknob! Also, they can bite THROUGH wire, concrete, etc. he can be very destructive when he wants his way. he can even bite through a brazil nut in only one chomp.... definitely not for anyone unless you can handle a "tame" exotic animal who you have to lay the rules down for, or else they WILL get their way.