Personally I like sumps.
All the plumbing, heaters, filters, etc are hidden in the cabinet below, makes everything look neater.
Plus you're generally skimming water from the surface, which clears off the film that can form on the top, and removes anything else floating too.
They also make water changes very easy.
Plus they're much more fun to set up.
Have had lots of tanks over the years, from when I was about ten.
Eheim are great, used one on a 6x2x2 tank for years was great, but can't beat the sump for a large tank I had a 8x2x2 with a large sump filter,super neat and works so well, almost no maintenance required, may be clean it once or twice a year, and then only clean one half so as to not upset the natural bacteria in the sump too much.
Aqua One are great for the first month or so and they start falling apart fast, I had the Eheim with built in heater element, and digital temperature control, was a great item.
Also had a Aqua One all in one tank, was really nice for about 12 months then everything started to deteriorate, the plastic lid started cracking, the lights just fell apart the plastic was not really stable and just crumbled turning to powder went to Aqua One head office in Ingleburn and met with the manager took the lid there and they said, it's old what do you expect nothing lasts for ever, and they offered me a free magnetic glass cleaner thing worth $5, I did not even take it and left in disgust.
Will find some photos and post them up when I am at home, at work at the moment so no photos
