Tough call between these two. Pricing is similar. The Sony VPL-HW40ES is $2499 less any promotions, and the online price of the BenQ W7500 is about the same or $100 higher at this time. The BenQ comes with one pair of 3D glasses, the Sony with none. Both have 3 year parts and labor warranties without replacement programs.
The Sony VPL-HW40ES is an LCoS projector with three panels, vs. the W7500 which is a single chip DLP projector. Both are very similarly equipped. The BenQ has a 1.5:1 zoom lens, and lens shift while the BenQ W7500 has slightly more zoom range at 1.6:1, but also has slightly less lens shift range. Call it a tie, but what matters is will it place the way you want it in your room. For a 100” screen size, for example, the Sony can be placed about 8 inches higher up above the screen than the BenQ, which would tend to be an esthetic advantage if you have higher than usual ceilings.