90 vs 2 45s?

[cobray]

I was under the impression that I should avoid 90 degree bends in my plumbing if possible. Right now I'm trying to do it using all 45s.
Is it just a matter of preference? Or is there enough benefit to justify the extra effort of eliminating all 90 degree joints?
I'll attach pics of my current mock up.

Thanks!

 

[KStatefan]

If you look at the equivalent length charts there is not much difference between 2 45 fittings and 1 90 fitting

PVC Pipes - Equivalent Length and Pressure Loss in Fittings

Minor loss in PVC and CPVC fittings expressed as equivalent length of straight pipe.

www.engineeringtoolbox.com

 

[His Coral Highness]

Not really much of a difference, especially for the return lines. And that return pump is going to be very low pressure compared to what PVC could be used for. I’m f anything there might be something to be said for using it on the overflow so you are less likely to have anything build up in a horizontal “dead spot.” But it does look sharp the way you have it mocked up, as long as measuring it and glueing it isn’t too much of a pain

 

[KStatefan]

If you switched to street elbow at the tank you could get your plumbing closer to the back.

 

[RocketEngineer]

2 45s are better than 2 90s. There’s no benefit replacing a single 90 with two 45s. It only works for jogs.