Well, for me, the question is whether you’re after someone for gameplay or waifu reasons.
How about both ? All 3 of them are good for me .
Then you’ll just have to decide whether you wanna go for a near-sure chance of getting Ch’en (near-sure cause even at 9 hours the Nuker tag has a slight chance of dropping though Top Op will never drop as long as the timer is set to 9 hours), or if you want a 50% chance at getting Nightingale/Shining alongside the 50% chance of getting a dupe.
And since the latter still relies on the Support Tag, my earlier point stands that there’s that ever so tiny chance of the Support tag dropping.