To be perfectly honest with you, ultimatley you will find that the MFP devices made for the home-user marketplace are a much of muchness.
The primary goal of the manufacturers when making home-user products is the retail price point, and this is reflected in the parts used and shortcuts used in order to provide software. So you are always going to find flaws in one form or another in all the products.
Yes you may find people on here and elsewhere saying theirs is better, but if you think about it, they will be providing a somewhat biased opinion because it is unlikely they've had any proper hands on time with the competing products. So you're better looking for group tests in magazines or such like.
In relation to paper jams specifically, remember, the mechanical process involved is only part of the story. The characteristics of the paper involved (weight, coatings etc.), as well as handling and storage of paper will play a larger part in the risk of jams than you may think.