Query to return values from table B when newer than record in Table A

I have a table with a member's name, address, etc. and a time stamp of the last time the record was updated. I have a second table that holds updates to the member record, a holding table, until changes are approved by staff.

I have a query that returns data from the member table. I now need to check the updates table, and if the member's record in the updates table has a more recent time stamp, return that record instead of the record in the member table.

I tried a few things such as a UNION with Top 1 but it's not quite right. I could make a complex CASE statement but is that going to perform well?

It sounds simple, get the most recent record from table A, and the most recent from table B and return the one record that is the newest.

SELECT name, address, city, state, zipcode, time_stamp
FROM Member
WHERE ID = 123

SELECT name, address, city, state, zipcode, time_stamp
FROM MemberUpdates
WHERE ID = 123