Your RuneScape Shopping List (DXP)

You get the same amount of xp for stringing and fletching. That said, fletching is slower as each action takes more tics to complete. Stringing is faster, but it comes with a lot more activity on your part. You need to get a new inventory every... 9 seconds or so while I recall fletching taking around 40 seconds per inventory.

I'd say definitely do the stringing during dxp. Your xp/h rates will be much higher so you'll have time to do other stuff as well!

Update for me: Regis will be aiming for 99 construction and 99 herblore over the dxp weekend! In the unlikely event that this endeavour will not cause my hand to drop off I'll probably keep myself busy with cooking, crafting or smithing.