A team where you have to ask who is going to do the work is one where people can’t get help when they are in trouble. It shouldn’t matter who gets assigned to it first, if they can’t do it, someone with more experience will step in.
This is what those stand up meetings were supposed to be for. It’s not supposed to be a meaningless ritual. If people can’t get help, or are afraid to ask for help, something is wrong.
An experienced person will likely take half the time of an inexperienced person who gets help.
If the inexperienced person pesters the experienced one much that it doesnt take more time, that would imply that the experienced people aren't (on paper) getting much done, because they are too busy teaching to do much else.
The actual balance of course depends on the experience gap between the assignee and assigned work, but the notion that any two people on a team will always get the same work done in the same amount of time is silly.
This is what those stand up meetings were supposed to be for. It’s not supposed to be a meaningless ritual. If people can’t get help, or are afraid to ask for help, something is wrong.