If you plan to only have one tank leveled up to 60, I recommend war or drk. They're better than pld for dungeons due to pld's lack of aoe dmg, and has higher single target dps as well (war wins among the 3 tanks, since drk won't have storm's eye in 1 tank dungeons). War and drk are also much better when you do unsync lower lv dungeons with your wife as a healer (sometimes you have to do lv 50 contents and many of them can be done with 2 geared lv 60s so you don't have to wait for duty finder).

For raiding, nearly every single group out there has a war due to how powerful it is in terms of dps and utilities (and how bad a pld/drk composition is compared to pld/war or drk/war). While pld and drk are also desired for raids, you might be expected to be able to switch around between the two depending on the raid, pld excels in physical dmg heavy fights, while drk excels in magic dmg heavy fights, and the other tank slot is almost always reserved for war. This will become less relevant due to overgearing though.

However since you mentioned that you don't like the complexity of rotations of melee dps jobs, you probably want to know that drk has more off-gcd skills that are weaved between gcd skills, as well as resource (mp) management, making it more complex than war/pld (pld is the simplest tank, rotation wise).