They're all pretty good. Just make sure you get one that is good quality (it doesn't look like it'll fall apart/break/lose pieces) and has the different stitch patterns. Most machines these days come with multiple stitching, so that should be easy to find. It mostly depends on how much you want to spend on a machine, and if you want anything more than just the multi-stitch.
Personally, I have a Singer (just your basic multi-stitch machine) and I love it. My mom has the exact same one, which I had been using for a couple years before getting my own. The Singer works well, and is pretty sturdy. My mom has had hers for about 5 years or so and is still going strong.
You just have to do some research online looking at different brands and decide if you want any fancy additions or not.