Working in the trade I rate the Fluval tanks as high if not higher than Juwel,
The heaters are incredibly reliable (provided it is the Fluval tronic) and so are the light units, unlike Juwels IME.
Also IMO The U internal range of filters are very good and are likely to outlive the powerheads used by Juwel.
However the external range does let the brand down quite significantly IMO and i would personally choose the package with the internal if you can (which can be used as a backup or easily sold) and then spend an extra £60 on a Tetratec Ex1200 or eheim classic to run the tank.
Also admittedly the doors on the cabinet can be fiddly, I have not personally known any cabinets to bow, but you have to be quite the perfectionist when putting together the cabinet, in order to get the doors positioned in exactly the right position, (a few mm out and you will have trouble opening the doors)