Best: Aston Martin Crystal KeySome 20 years ago, Aston Martin was part of Ford's Premier Automotive Group. This meant, among other things, a remote key fob borrowed directly from Volvo. In 2000s Aston models, you had a cool glass starter button in the center control stack that allowed your V8 or V12 to roar to life. As the decade drew to a close, Aston Martin had a better idea. By the late 2000s, most Aston Martin vehicles would get a crystal key. This didn't include an actual key blade; it was simply a remote fob. The bottom of the key featured the Aston Martin wings encased in super-durable and super-expensive crystal sapphire. The key was so special, Aston Martin decided to give it its own (ridiculous) name: the Emotion Control Unit.Because this era of Astons didn't have a classic ignition tumbler, you had to insert the crystal key into a slot in the dash, with the logo the right way up, and hold it in to start. While you were driving, the Aston Martin logo would always be there, just to remind you how cool you are.Worst: BMW Display KeyWe already mentioned that a lot of modern cars have totally skipped out on actual key fobs, opting instead to place all of those functionalities inside an app you download on your phone or watch. A few years ago, this wasn't really happening in the car industry, but someone at BMW had a great idea.The automaker decided to give some models the option of a huge key fob with a built-in display that could show certain stats and functionalities. This was commonly seen on models like the previous-generation 7 Series and the i8 sports car. It sounds cool in theory, but the execution wasn't exactly great. For one, this key is heavy and bulky, taking up significantly more space in your pocket than even the chunkiest of key fobs. The screen was also incredibly laggy, and for a lot of people, this option didn't really make much sense. BMW eventually abandoned the idea and returned to normal key fobs.Worst: Mini Key FobThis does not apply to the latest generation of the iconic hatch, as Mini finally came to its senses and started including a fairly normal pill-shaped key fob. On the way from the regular key to this new fob, however, we had the dreaded circular key fob. Almost every Mini model from the R56 hatch to the previous-generation Countryman used a version of this device. It's shaped like a frisbee, but then it has a strange growth on the bottom so you can attach a keychain to it. You could easily forgive this, because it's tough not to be floored by the Mini's charm. Without rose-tinted glasses, though, this is just a silly design.Later versions of this key placed the buttons in a more sensible area, i.e., in a vertical row on the back side. However, the earliest versions put the buttons around the perimeter of the disc. Plus, as I can personally tell you about these keys, the labels on them rub off. We love the Mini, we love its design, but we're glad this key fob was retired.Best: Hyundai Logo KeyFinally, something that isn't from a multimillion-dollar hypercar. We are living in an era where normal cars that can be bought by a lot more people have really cool key fobs. Previously, Hyundai keys were a pretty lame affair. Some of you might remember those strange, thin remotes that were attached to a conventional key in the late 2000s and early 2010s.A lot of recent Hyundai models have moved to something far more interesting, and also absolutely genius. The Hyundai logo is now also the key fob. It's oval-shaped, and the buttons and functions take up what would otherwise be empty space in the logo, specifically on the inside and around the letter H. If your Hyundai has the remote parking feature equipped, those buttons are on the side, while the face is taken up by the requisite lock, unlock, hatch/trunk release, and so on. This is a genius idea, and even though this key is still made of plastic, it's definitely much cooler than your standard boring black remote fob.