They're both solid trucks and have great features out of the box. The x and xl are great trucks but I've heard the following go wrong on them: stock radio can fail as it happens to one of my friends, if the diffs are not shimmed that can lead to failure down the road, the x has the big bore setup for shocks whereas the xl has 8 shocks, both trucks do come with hpi's best bullet proof diffs,the servos can go which is quite common, the xl handles a lot better due to its longer and wider track, the x engine has a better reputation of less worries when compared to the xl engine, the x does wheelies more imo due to it being lighter. I own an XL and 2 of my friends have the x so I seen them both in action. I think you can't lose no matter which truck you choose and happy shopping, Steve.