Holy paladin tanking? Better than prot paladin?

Recently comparing builds and results with a friend, regarding paladin tanking, it has come to our attention that for most trash packs and the majority of bosses, groups seem to be more comfortable with a holy paladin wearing full mail/plate + shield, than a warrior-emulating protection paladin.
It's simple, by having a 31/20/0 build, the paladin I've used can not only holy shock for a very decent amount of threat, but my higher intellect allows for judgement of righteousness to crit frequently, as well as my mana bar allowing for a near constant uptime on consecration. Furthermore, having 5/5 Focus + concentration aura has allowed me at times to simply spam heal myself with no pushback, keeping consistent threat and helping the healer while at it, again due to a very sizable mana bar.
On the contrary, the strength/agility stacking suggested for the protection paladin, as well as a build relying on Divine Strength, all too reminiscent of protection warrior, leaves my friend's protection paladin with a pitifully small mana bar, no immediate threat moves like holy shock, minimal capacity of threat from self-heal. The plus side seems to be, that having BoSanc + chain spam holy shield allows for very decent thorns damage coupled with retribution aura, yet I'm not entirely sure if that is really better than my alternative.
Thoughts?
It's simple, by having a 31/20/0 build, the paladin I've used can not only holy shock for a very decent amount of threat, but my higher intellect allows for judgement of righteousness to crit frequently, as well as my mana bar allowing for a near constant uptime on consecration. Furthermore, having 5/5 Focus + concentration aura has allowed me at times to simply spam heal myself with no pushback, keeping consistent threat and helping the healer while at it, again due to a very sizable mana bar.
On the contrary, the strength/agility stacking suggested for the protection paladin, as well as a build relying on Divine Strength, all too reminiscent of protection warrior, leaves my friend's protection paladin with a pitifully small mana bar, no immediate threat moves like holy shock, minimal capacity of threat from self-heal. The plus side seems to be, that having BoSanc + chain spam holy shield allows for very decent thorns damage coupled with retribution aura, yet I'm not entirely sure if that is really better than my alternative.
Thoughts?