Hi,
while 8x42 is the default birders bin, the 8x32 format gains followers... coatings get better so the difference in brightness is less noticeable, people might not like the heavy brick around the neck (or use a harness and don't care).
I usually take a pair of 8x32 when I'm travelling, when there is a chance to actually do some birding, a scope and tripod too...
As for what bins to buy we need to know whether you will wear glasses when using the binoculars. If you do, you need more eye relief (the distance of the image from the eye lens) and this is usually in short supply with 8x32 pairs.
Joachim