Welcome!
Many years ago Makita was having a sale that offered both a drill and driver, with the same 14 volt batteries, basically for the price of either the drill or driver. WOW! I use the driver more than the drill - it becomes an impact driver (like the air drivers in auto shops) when the screw gets tight, so the battery lasts a long time, and the power from the impact is immense. I have driven a 1/4 inch lag bolt inches into hardwood with it, but it is gentle enough to screw on furniture hinges.
Conclusion 1: A driver is enough different than a drill that once you use a driver, you will never go back
Conclusion 2: 14 volts seems to be a great size. I doubt if the 4 to 8 volt drivers would have enough power to make me happy
Conclusion 3: Be sure to get a name brand that is likely to have 3rd party replacement batteries available. (The new batteries are often newer technology with more life, and are often available after the manufacturer stops making them)
Conclusion 4: I was never happy with my DeWalt 12 volt drill system. I love my Makita, but also have other tools from Bosch that are very good. I have a few Festools but they wear out as badly as Bosch and similar.