I suggest a floor that has a slight slope toward a door for easy washing out/cleaning. As we all know flat floors are not flat and one that has a small natural drainage is very handy. I did it in my 40 x 60' shop and I do still have one place that holds a little water but the rest drains nicely.
I really hate my garage that has this feature, it creates more problems than it solves, in my case. I actually have two 2-3 car garages, one with a center drain in each bay, and one with the floor sloped toward the doors at 1" per 10', and would never do another sloped floor in any garage I own. Center drains are just way better, for several reasons.
The primary trouble with the floor sloped toward the doors is:
1. The way most builders want to handle the slope at the side walls, and most particularly each corner of the building on the same (front) wall as the doors. Because most builders usually want a level sill, esp. if prefab, this forces the floor to slope up dramatically between corner of the door and corner of the building. A 30' deep building may have 3" of drop from rear wall to the door, but then the same 3" of rise over just 2 - 4 feet from edge of door to closest corner of the building. This makes placing equipment, benches... anything along the side walls a total nightmare.
By contrast, a center drain for each bay cuts all slopes in half over the long run, and creates no short runs between the door and leveled sill all the way around the building.
2. Draining water toward the door will cause your door seals to freeze to the concrete on cold weather, and then tear when you try to open the door. I've had this happen repeatedly, where I've just given up on one door in particular. That creates a problem with heating, as my heat pump can't really keep up against a leaky door in very cold weather.
There are of course other solutions to this problem, but a center drain prevents the problem altogether, by draining all vehicle water away from the door.
3. A center drain allows you to direct water anywhere you want, even capture it if you want, versus just draining it out onto your driveway, where it can ice up in winter.