There are pro's and cons between the two.
The Fluval can hold more media (more flexible), has a higher flow rate. Some say they are noisy, others say they aren't. Its not as high quality particularly the hoses, inlet and outlet but its not by any means bad quality and is far better than a re-branded Chinese designed filter. Due to the hosing, inlet and outlet design the Fluval is more flexible when it comes to fitting it on different tanks. The pipes are large so you may need to trim your hood, I can to trim my Juwel tanks hood for it to fit.
The Ehiem is smaller and can hold less media, its also a bit low on the flow rate. Its 3.75x tank volume, its a tad below 4x which is what you would normally aim for in a non planted tank but I think it will be fine. It has better quality parts over the Fluval, but the inlet and outlet are fixed and not adjustable. You may have issues with the outlet if your tank has a tall rim where there is a large space between where the pipes hook on and the waterline. If you don't like the green hoses/inlet/outlet that can also be a problem.
They will both do the job at the end of the day, Nasher and I just recommend something more expensive because they are better designs, high quality or both. You get what you pay for at the end of the day. As I mentioned earlier, I own a Fluval 306 but if it broke I wouldn't buy another and I would spend the extra on the Oase.
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