I can't pick what is best for you. If I had a billfold full of excess cash, I'd like a Toyota 1HD-FTE. But I would certainly not kid myself that I'd get back the money spent doing it for the fuel economy improvement gained. .
Toyota's naturally-aspirated diesels do not take too well to turbos unless they are low-pressure units. When pushed they tend to overheat.
My opinion, of course. I'm sure there are those that will disagree.
Adhesion on both sides keeps the moldings tight against the body and also reduces the amount of dirt that gets in between the moulding and the body panels. Toyota did that for a reason. I don't know of an easy way to add that to gaskets that were not made with that provision.