An outlanding in a glider with a 150' fpm descent rate is a more leisurely process than in an airplane with a dead engine coming down at 800 fpm.
In a glider at 1500' you have plenty of time to examine the field and perhaps select a more suitable looking candidate, but you do learn more and more about the field as you get lower and sometimes you don't particularly like the new information. My last field revealed interesting contours on base and I abandoned my first landing spot in favor of a nice flat spot.
When at 2000' AGL in a glider, I like to have a field in my pocket. It may remain there for quite some time until I either get away or it claims me.
With low ceilings or airspace that restricts my altitude flying power, I tend to hopscotch from one decent field to another so that I know just which field I will be using if the engine suddenly packs it in.
As you get lower your choices for a landing spot shrink, but being able to retract spoilers to go back to a 40:1 glide ratio gives you considerably more flexibility when on final.