I'm not sure how good the Samsung you link to is as I can't seem to find any expert reviews. However, samsung do tend to make good monitors, so it is not likely to be terrible.
The BenQ on the other hand is widely known to be a solid monitor and great for gaming.
As for HDMI vs DVI, it really depends on the cable you use TBH. IF you are using a dual link DVI cable then obviously it will be thicker and less flexible because it can support twice the bandwidth of a HDMI v1.3 cable. However, if you get a single link DVI cable, it should be the same thickness as a HDMI cable.
HDMI and DVI are electronically compatible - so the image quality is the same.
Edit: PCM2, good to hear you have had some experience with this monitor - if you say it is better, then it is better. Will you be posting a review of it on your site, or is it very similar to the BX2350 you have already reviewed?