TheLastOne
Person of impeccable tastes (for destruction)
The 1 mana/day version is the sort of shielding and potency you'd expect from anyone, which will most likely (unless you are a high-gnosis master) be within 1-3 successes.
When you ritualcast your armor up to something like 15 potency, you are basically saying "THIS IS MY WAR FORM AND I AM GOING TO MAKE WAR ON YOU" to anyone who looks at it.
But yeah, mechanically you are better off just Ritualcasting it so it has months of duration rather than spending precioussssss mana every day. This is, ultimately, a weakness of mechanics and intent running into each other (the 1 mana/day version is the one that Mages are meant to use in their morning shave/toothbrush/counter-gribbly/breakfast routine, yet the ritualcast once-a-month version is infinitely better, as long as you can take one day a month to ritualcast that, until you hit higher gnosis where you can do it in an afternoon.)
No, because it's actually less work and less Mana to do the extended casting, and so it's what everyone who can will be expected to do, because only a utter moron wastes Mana. Mages go to war with each other over sources of it.