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@Mikenetic
It's primarily an aesthetic choice.
I tend to run my bikes with about 8cm of drop between the saddle and bar centre, so on a horizontal TT I wouldn't have much seat post exposed. And using a branded post I'd probably have "Ritch.." or "Thomps..." showing, which would drive me round the twist.
There are claimed comfort benefits from a sloping TT because if you have a lot of seat post showing, especially a CF one, as it'll flex a bit.
One of the advantages of fillet or TIG is the freedom to set the angles as you want.