i am still new at vacuum. so it might be a stupid question, but still.
 
is there a difference in structural properties and rigidity in finished part between wet layup in vacuum bag and infusion.
so the question is quality of product, not just appearance and optical Finnish.

From my point of view, both systems will reach a similar structural quality if properly done.

Both systems are vacuum asisted. So, if same vacuum is reached, the structural diference will be the resin content.

And it'll depend on the process. The level of vacuum and resin content.

Then you can go to OOA (out of autoclave) prepregs.
Here, the resin content is just the desired as is not variable (you can suck a bit, but shouldn't). And the curing temp will be higher, around 85 to 120º C on the simplest ones... that curing will give a bit higher structural performance...

So, from my point of view, the difference will be given by the details.

When you stop the feeding line, The level of vacuum, when you stop the vacuum (before or after resin's curing), for the infussion. Or vacuum pressure and resin content for the wet layup (squeege the fabric after impregnating...)

The difference may also be the geometry of the part, making one of the processes more simple than the other and driving into a nicer result...

(I like wet layup with a good vacuum and a low resin content. But infussion also gives nice parts if properly done.)

i was thinking in same direction, but i wasn't sure.
and i saw in other post that infusion on UD isn't simple

thank you for answer

You´re welcome !