Putting a sump on that size of a tank is almost always cheaper than running two canisters, but sumps do tend to be more difficult to set up and sometimes, maintain. If you don't want to drill your tank or do a lot of set up work, a sump wouldn't be for you. The 100-200 dollars more you spend with canisters may be worth it if you want ease of maintenance and setup. I personally like sumps as I have some experience with them, so set up and maintenance are not an issue for me. They also do a slightly to significantly better job in terms of filtration (depending on the style of sump). I also like the feeling of knowing you just saved a lot of money. Call me cheap, but I sure do like the extra cash lol.