Akai
Pros:
Reasonably hot.
Gosho has decided he's badass, so he gets to do cool superhuman stuff
He and Conan are cute together
We see Gin more often when he's around
Cons:
He took an undercover job where he had to ... solve some random chick's case ... to get info O.o Seriously, wtf FBI.
He makes secret plans that involve Camel beating his ex-lover, but won't even have him beat up a coma patient a little to see if she's really in a coma :x And instead we had to wait 5,000,000 chapters for Eisuke to run with scissors.
He doesn't really do that much :V
The evidence points to him being sort of a butthead.
Okiya
Pros:
He can cook.
He looks good in an apron.
He and Agasa are cute together.
Him living in the Kudou house without Yusaku and Yukiko's permission, right across the street from Haibara, for like 127,948 chapters is legitimately funny.
Cons:
He never does anything. :V
The evidence points to him being sort of a butthead.
Conan is unbearably smug whenever he's around.
He likes being mean to Haibara, apparently, since he knows full well she's scared of him and yet keeps getting up in her face.
Hm...Okiya has more pros, but Akai's hotter. Let's go with Akai. And because of the Gin thing.
Feel free to add pros and cons I missed.

I think we can have a reasonable discussion here.