Possibly the best service we can render a client regarding their choices / decisions with window selection is to steer them as far as possible from choosing casement windows. Every "name" brand without exception, of casements is prone to sash fatigue,some sooner,some later,it is a matter of when not if.
When sash fatigue occurs,the only remedy is to replace the window.The three durable not disposable brands I mentioned are well aware of the nuances of sash fatigue;designing,building and warrantying their windows against that common short coming is something they build into their products.
If a consumer is unfortunate enough to choose a casement by one of the disposable manufactures they have set themselves up for a constant and continuous cycle of window replacement. Only exception.....if they never or rarely open their windows.