wouldnt this be better?

I was going to order this
http://www.amazon.com/SHURflo-182-200-Pre-Pressurized-Accumulator-Tank/dp/B000N9VF6Q/ref=sr_1_1?ie=UTF8&qid=1379254273&sr=8-1&keywords=shurflo+accumulator+tank
but wouldn't this be better?
http://www.amazon.com/gp/product/B001AZL562/ref=noref?ie=UTF8&psc=1&s=hi
it seems the latter is for use in a home, whereas the shurflo is made specifically for the rv pumps, and aplications, but I cant seem to find any reason not to go with the bigger cheaper one.
on the other hand im only going to have 7 gallons of fresh water, so I think a 2 gallon accumulator might be overkill, but ill still take some comments.
http://www.amazon.com/SHURflo-182-200-Pre-Pressurized-Accumulator-Tank/dp/B000N9VF6Q/ref=sr_1_1?ie=UTF8&qid=1379254273&sr=8-1&keywords=shurflo+accumulator+tank
but wouldn't this be better?
http://www.amazon.com/gp/product/B001AZL562/ref=noref?ie=UTF8&psc=1&s=hi
it seems the latter is for use in a home, whereas the shurflo is made specifically for the rv pumps, and aplications, but I cant seem to find any reason not to go with the bigger cheaper one.
on the other hand im only going to have 7 gallons of fresh water, so I think a 2 gallon accumulator might be overkill, but ill still take some comments.