Flat/Scale MR blues in Bot Lane

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Intrinsic Entity



Note: Scaling runes are equal to flat runes at lv9 and are better >lv9. At lvl 1, flats give +12 MR and scaling gives +1.35 MR. This is an approximate 5-15% dmg reduction difference applied to base MR.

Are there strong arguments for using either glyphs (blue runes) over the other? (I'm supposing that AD and support will have the same reasons apply)

I was thinking that, during lane phase, agressive AD (corki/MF) and agressive supports (leona/alistar/taric) or basically any support do AP dmg therefore flats are better.