Buddy Dive Resort is the more expensive by over $800.
Not sure of the current situation; in the past when I looked, I recall Buddy Dive Resort rates tended to include breakfast buffet, which they valued at $15/day/person (food is rather expensive on Bonaire, and it's a pretty nice buffet); if there are 2 of you for a week, 15x2x7 = $210 (granted, not $800). Just saying included breakfast does impact the value proposition. They came and got us at the airport, and took us to the resort, and from the resort back to the airport at trip's end. It's also important to scrutinize whether a given package deal includes any boat dives, since if one does and a competitor doesn't, that can run up the price.
Last I heard, BDR had 2 onsite restaurants, one upscale (and I haven't eaten there); the other was okay and I ate there a number of times.
At some point in the past, I noticed eating out I tended to order a pretty similar setup; calamari appetizer if they had it, and 'catch of the day' (usually wahoo or mahi mahi with fries and a mix of vegetables).
Oh, unless things have changed (note: hereafter, talking about restaurant service on Bonaire, not specific to one on Buddy Dive Resort), don't count on sodas offering unlimited refills. The price may be per can of soda, and if you order a soda with your meal, they may bring it out well in advance. Service can be slow and you may need to hail the server and ask for your check when you're done; the style is different from the U.S.