specific aegyosal pens vs regular pallets for aegyosal, any differences in your experience?

personally i’ve always used the pens, mainly because i was new to k beauty and it was easiest to learn.

but following a lot of makeup influencers, i realise most just use regular eyeshadow palettes for their under eye/aegyosal as well.

what are the pros and cons of each? is it just a marketing tactic?