I can vouch for the 'ole Nichimo Oscar; 'tis a decent kit needing only a small amount of work. The worst part of building that thing was having to sand down the wings and fuselage which had a slight texture to them. (A result of the molding process used, but I ain't gonna get technical here!
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Anyhoo, I've posted this before. Matter of fact, this is the very first image I posted here on FSM and it's kinda small. I'll try and replace it with a larger image. (DONE!) This was built... I dunno, maybe 11 years ago.
If I were to build another Oscar I'd use one of the Hasegawa kits. The Fine Molds ain't bad, they're great kits. But they do pale alongside Mr.H's offering.
However, if I still had an FM kit (and no Mr.H) and had the urge to build an Oscar tomorrow, I'd be perfectly happy with it.
Arii/Otaki? Yech! Just my personal opinion. Used to love their stuff, when it was cutting edge. And it ain't that bad really, but there's too much bad stuff going on in each and every one of those kits to prevent me from turning one into a serious build. (Plus the fact that I'm lazy!) I've owned every one of them several times and the only reason I keep grabbing 'em is for trade bait for Dan the Man.
Oh, and they're good testbeds too...
Fade to Black...