AOC are decent enough. ASUS probably have the better QC, but the larger of the two is ~175EUR and outside your budget, and neither are IPS panels.
So really, it comes down to budget. For the nicest panel, with a reasonable response time etc, some of the better known manufacturers aren't quite in budget.
So you either sacrifice the panel etc (I wouldn;t), or you look to a more 'non-standard' manufacturer.
Considering it's a new monitor, you can always return/replace if you end up with defects etc.