. I would like to make sure I have the most ergonomic possible handlebars.
Simple answer, there is no such thing. Handlebar likes and dislikes are nearly as subjective as saddles, which is why there are so many designs and styles. My own preference is drop bars with a particular liking for FSA's Wing Pro design but that me, not necessarily you.
Many riders don't like drop bars at all and prefer flat bars (MTB type) which I detest. Others like Mustache, Trekking, or a variety of similar flatter designs.
Drop bars (and the Trekking designs) allow several hand positions so you can move around during a ride and avoid hand numbness and allow you to get lower when fighting a headwind. Drop bars also come in a variety of bends and "reach" and drop dimensions so you can usually find a design that suits your style and physical needs.
Flat bars also come in a variety of widths and configurations and "bar ends" can be added to give an alternate hand position. One problem with your LHT is that if you decide on flat bars, you will need replacement brake levers and shifters since the ones that come with the LHT's drop bars won't work on flat bars.