Vertical junction from toilet pan

[Olf]

Toilet pan to be located directly above main soil pipe (running at small gradient under the floor)

Builders don't give a sh!t and claim normal 90° junction (pictured on the left) will do, but when I imagine it, any (semi)solids will splash equally in each direction and some have chance of remaining upstream from the junction. My thinking is 45° bend + 45° junction (on the right) is superior, as will change the vector of the attack from vertical to horizontal, and so direct the impetus goes where it should. Fellow thinkers welcome to contribute

[PeterW]

One on the right with the Y laid flat and then a 90° elbow pointing upward. Will push the flow down the line. Upward tee is a bad idea. 

[ProDave]

Why are the builders doing the plumbing?

[Marvin]

1 hour ago, PeterW said:

One on the right with the Y laid flat and then a 90° elbow pointing upward. Will push the flow down the line. Upward tee is a bad idea. 

+1

[Nickfromwales]

9 hours ago, ProDave said:

Why are the builders doing the plumbing?

They always do groundworks. This is groundworks not plumbing