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I would go with the "Y" fitting. My reasoning is based on a quick and unobstructed dump of your Black Water, and then a good flush of your Grey Tank.
A 45 degree route is, in my opinion, better than a 90. You will already have one 90 where you go into the ground. A second 90 would slow solid things down
Good Luck,
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Pull Toy
Steve & Jan, Ava & Emma (Mini Schnauzers):
2016 F350 Lariat 4X4 Powerstroke CC/SB "PULLTOY V"
2013 Alpine 3535RE "MAGIC CARPET IV"
Proud Navy Vet! 
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