Hey, it's Cuba! There's certainly going to be some variation from box to box. Not always easy to say within the same box, though of course it happens. But it can be a matter of time and conditions too.
As for most consistent? I want to say Monte #5 is pretty consistent flavor-wise. But that's sure not absolute, just better than most.
And maybe surprisingly, among the most consistent small cigars for me are RyJ Coronitas en Cedros. Might sound like I'm making a joke with that - they do all look the same more so than most, seein' as they're wrapped in cedar. But, no, those little "cheap & cheerfuls" have been extremely consistent for me over a dozen or more boxes since I first got onto them some years ago. That's wrapper color, flavor profile, and draw.
I smoke in moderation. Only one cigar at a time. - Mark Twain