I agree that the vertical looks the best, but that the horizontal is more foolproof and saves wasting space and interfering with rode locker access under deck in the v-berth.
I have a Vertical Quick Aires with a horizontal motor below deck, and while I don't use the v-berth for sleeping, it does take up space.
The vertical windlass with a horizontal motor is a better system because it has a better seal, and the motor can be mounted horizontal because a worm gear drive is utilized, which can develop greater mechanical advantage.
Moose and I had problems at first with that windlass because the pressure finger (called the Fleming) wasn't strong enough to pass the chain/rope splice, so I developed a splice with a smaller diameter.
There are a myriad of manufacturers and models. I'd stick with something that others that I trust say works in the boat you have. It's a lot less trouble that striking out on your own.
Getting the windlass, rode, anchor, and anchor roller to work together to self-launch the anchor can be an engineering task that takes a considerable amount of time to work out! Each combination is unique.
You need the self-launching feature to take full advantage of the windlass's possibilities. It allows you to safely launch and retrieve the anchor without going up on the deck in hazardous seas, and is one of the most useful advantages of windlass ownership!
P.S.: An alternative is to have a husky 15-20 some year old male offspring that you can convince needs the anchoring/retrieving exercise as part of his football conditioning! (as per B~C). However, the food bill for same may be more expensive than the windlass. Not to mention the other risks and commitments.
Joe. :teeth :thup