Which is the best Honda Civic hatchback?

It depends on what you're going for. The SI edition is considered Sport Injected. Generally it will have a slightly larger engine. My 1995 Civic Si has a 1.6 cubic liter engine with VTEC, along with four wheel disc breaks. The amenities are sometimes dealer options, my car does not have AC but some civic SIs do come with it. SIs should have tilt wheels, drivers and passengers side mirrors, etc. You can generally compare the differences at www.kbb.com