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So in my ork lists I pretty much always take lootas.
Recently I've been taking two squads of 8 as opposed to 1 squad of 15. My reasoning being that instead of rolling bad once and only shooting 15 times I think have a higher possibility of rolling better amongst two squads and shooting more. I realize the lower numbers of models per unit make it so that I might have to take morale tests sooner per unit but I still have two units.
Here's how its broken down, a unit of 15 can either shoot 15, 30 or 45 shots 33% of the time.
Two units of 8 can shoot either 16, 24, 24, 32, 32, 48, 48 shots (not sure of the math on this one)
So what do you think?

By spiltting units, you reduce the variance (randomness) of attacks but don't really increase the mean (average) of them.

1x16 loota:
16 shot 1/3
32 shot 1/3
48 shot 1/3

Average 32 shots

2x8 loota:
16 shot 1/9
24 shot 2/9
32 shot 3/9
40 shot 2/9
48 shot 1/9

Average 32 shots
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In terms of list building, 2 units also reduces the amount of overkill and gives better shooting efficiency, because you don't gain anything killing a rhino three times over.

How much randomness you want in you list depends on your relative strength to opponent. If you are playing a stronger list and is a stronger player (win >>50%) than you want to minimized randomness to prevent bad rolls killing you. If you are playing a inferior list or is less skilled, you want a high randomness list to use it to edge out a few wins.

I have found that it would be best to split them in 2 groups of 9. 15 of them is just overkill and it is much better to run 2 squads that can shoot at two targets rather than pumping 15-45 shots into a single rhino.

Also squads of 9 are much better than squads of 8 because they have to loose 3 casualties before taking their moral check (which they tend to fail a lot for me).