I check both when doing reviews. Style and "cleanliness" of the code is important as other people are also expected to work with it. Also I follow the saying th

I check both when doing reviews. Style and "cleanliness" of the code is important as other people are also expected to work with it. Also I follow the saying that code is more often read than (re)written, so that should not be neglected. Structure of the code, as in relationship of classes, data flow and high level design is also important and checked during review.