[frank0]

Assume you play 2/1 or sayc. X, Y and 1NT are natural but 1NT could be forcing, semi-forcing or non-forcing.
In the poll, "usually" means you are allowed to have a few exceptions beside your general rule(e.g. usually takeout but if it's 1♦-1NT they overcall 2♣ it's penalty)
Asking opinion on 1X-(P)-1NT-(2Y)-double or 1X-(P)-1NT-(2Y)-P-(P)-double types auction.

For people who usually(always) play takeout:
Do you make it difference when the 1NT implies other suit(1♦-1NT) and they overcall that suit(♣)?
Do you make it difference when 1NT is NF and very shape-specific(1♣-1NT)?

For people who usually(always) play penalty:
Do you make it difference when you're 1NT bidder, and double the overcall where you deny 4 cards?
You open 1♠, partner response 1NT, RHO overcall 2♥, what do you do with 5=1=(43) 15~16HCP

For people who usually(always) play optional:
I'm not familiar with this, can you share the reason why you think it's better than t/o or penalty? If you have exception to general rule specifies it.

For people who play it depends on case:
What's your (simple or complicated) agreement?

For people who vote 5:
Do I forget something? Tell me.

[Vampyr]

Missed the question at first -- found it on closer reading.

[awm]

I generally play takeout. However I suspect it is better to play it as takeout if partner could hold 4+ in their suit (Y) and penalty if he couldn't. The reasoning is that if partner will (almost) never leave double in, there are generally other competitive options available.