No, I'd much rather have the ability to no-sell damage DEX spells and abilities like fireballs and breath attacks, than an extra 8~16 HP between short rests.
1) Unless you're fighting a bunch of mages and dragons every day, I don't see how that's universally more beneficial.
2) It's 8~16 HP to
everybody in the party, not just you.
3) Your DEX save, even with Aura of Protection, scales poorly. Your DEX is probably 10, and you're not taking Resilient for DEX, which would be a waste, so your DEX save
at most will be +5. Most likely it'll be lower, because you're probably not going to have 20 CHA until high teen levels. Against DCs like 17 from the breath of a Young Red Dragon (CR 10), you're not going to be making that save too often in the first place. And the Shield Master DEX save bonus only applies when you're the only one targeted, so that won't help you, either.
EDIT: I'll use said Young Red Dragon's breath (56 damage, DC 17 save), vs. hypothetical Paladin with 16 CHA, 10 DEX (+3 DEX save):
w/ Shield Master = .65*56 =
36.4
w/o Shield Master = Above, + .35*28 =
+9.8 difference
That 9.8 difference is less than a Lv. 7 Paladin with 16 CHA gets, just to himself, from Inspiring Leader.