There is a wide variety of GU10 bulbs available. Not quite as many as standard Edison base bulbs, but still quite a few. For example, just doing a very quick search on Home Depot, I found bulbs from 88 to 600 lumens (one said 20 lumens, but I think that was an incorrectly entered data point for a "20 watt equivalent" bulb), various color temperatures, CRI, etc. Go to a specialty company such as 1000bulbs.com and you'll find even more.
That being said, the best option may be to replace the actual fixtures, as GU10 bulbs all seem to have the same basic shape. Because LED lights can be very thin (no need for a "bulb" except nostalgia and compatibility with existing fixtures), surface mount lights are often an option even with low ceilings. Or recessed cans. Or almost anything.
Starting point is not: Watts, "Watts equivalent" or physical size. It should always be how much light = lumens. Figure out how much light you currently get based on the bulbs in use. Then figure out if you want more, less or about the same total light in the room. And then you can figure out what to get. You can also consider getting more light than you currently have but using a dimmer to adjust as needed.
Don't be too scared about "fixtures with built-in LEDs" not letting you replace bulbs. If you pick decent quality fixtures they should last several years. Just make sure you get enough light, high CRI and a color temperature that you like.