I'm not familiar with the Vaude. I have a Vango Spectre 300, which is similar to the Banshee 300 (both 3 person tents). It's been fine in some pretty wet weather, though we've had a little condensation in it a few times. Without abusing it, we bent a couple of the pole sections, though they don't seem to affect it structurally. It's absolutely fine for weekends away.
That said, I think if it were me, I'd spend a bit more and get the Vaude. One reason is merely personal preference. I slightly prefer an end opening to a side opening. The other reason though, is that I think the porch, which can be unzipped on either side, is better on the Vaude.
That comes to the most important part of my post...
As others have said, different tents have different advantages & disadvantages. whether the Vaude is worth the extra money largely depends upon personal choice. If the grant covers either, and the money isn't needed for other purchases (other camping equipment?), my choice would be clear, but maybe not if I could include some other tents in the selection process, or if the cost was high on the list of criteria.
You haven't said what the budget is, how important cost is, if you have already narrowed your selection down, or the choice is severely limited by the grant received.
If you still can't decide, make a list of the criteria you think are important?
“In some ways, it is easier to be a dissident, for then one is without responsibility.”
― Nelson Mandela, Long Walk to Freedom