The decision to get a hybrid or gravel bike depends on the style of riding you want to do. If you intend to go on relatively short bike rides around town, on paved paths, or on light off-road terrain, a hybrid bike might be the better choice. On the other hand, if you plan to ride on more challenging off-road terrain, such as gravel roads or singletrack, a gravel bike might be more suitable. Gravel bikes generally have thicker tires and wider tire clearance, while hybrid bikes have skinnier tires and smaller tire clearance. Moreover, gravel bikes use flared drop bars while hybrid bikes use traditional flat bars. (source: [Cyclingnews](https://www.cyclingnews.com/features/gravel-bike-vs-hybrid-bike/), [Pedal Street](https://pedalstreet.com/hybrid-bike-vs-gravel-bike/), [Bikeaton](https://bikeaton.com/bikes/gravel-bike-vs-hybrid/), [CycleSeven](https://cycleseven.org/gravel-bike-vs-hybrid-bike/), [Fat Bike Planet](https://fatbikeplanet.com/gravel-bikes-vs-hybrid-bikes/))
There is a subtle difference between a hybrid bike and a gravel bike. For insight, a hybrid bike is a mix of a mountain bike and a road bike while a gravel bike looks more like a mountain bike and does not have a straight handlebar.
Hybrid bikes are most popular to commuters, novice cyclists, students, and more as the design is the most ideal for them. It has a flat handlebar that helps with cornering and braking components and wider tires for comfortable riding.
Gravel bikes are most ideal for all-around cycling with their on-road and off-road design and structure. These bikes allow riders to go on a long-distance as it is designed to provide riders great comfort. Gravel bikes are also typically lighter and versatile.
In terms of price, gravel bikes are much more expensive than hybrid bikes as it is built to endure more terrain. Gravel bikes have a wheel, gearing, frame, and brake types that provide comfort to riders and the ability to endure all terrains effectively. Hybrid bikes have a flat handlebar which makes it easier for riders to reach the controls of the bike. Hybrid bikes also have skinny tires that allow riders to get through traffic fast. Gravel bikes have a drop bar handlebar that gives riders full control of all kinds of terrain.
In conclusion, it really depends on what you really want the purpose of your bike would be. Either way, gravel and hybrid bikes are both great bikes.