I would recommend doing both 1 and 2 hours when trying new foods. I hardly ever test at 1 hour now, but when I was newly diagnosed and trying to figure out how various foods affected BG, doing 1 and 2 hours was very helpful. Now I usually test at 2 hours and not every single meal, but that's because I learned so much with all of the testing when I was newly diagnosed that I have a pretty good idea of how various foods affect my BG.
If your peak is generally at 1 hour, it's good to see if and when you are getting back down to baseline, or close to pre-meal bg, which is why you would still want to do a 2 hour test. You found that some foods spike you at 200+ at 1 hour, but you were back down to 110 at 2 hours. You might have a different meal and find a BG of 120 at 1 hour, but then check at 2 hours and find a number above 140. In that case, you might even check at 3 hours to see if it's coming down or still going up.
Have you or your doctor set goals for your BG range? My personal goal is to try and stay under 140 at 2 hours. When I was first diagnosed, I had tighter goals of staying under 140 at 1 hour and under 120 at 2 hours. I'm not perfect and sometimes go over 140, but I want to minimize my risk of complications so I generally try to stay in that range.
30 years old, thin type 2
Diagnosed: 6/30/11 (failed OGTT with bg around 260 at 2 hours)