question about best practice of Update query on MS Access local table and SQL serever linked table..

We have update queries in the system designed using the query grid,
where the data from a local MS Access table is set to update it to the sqlserver linked table.
I am curious to know which would be the best method

a) whether to use join in the update query like below and not having the where clause since join is already set on the ids belonging to both tables

UPDATE [Children-local] INNER JOIN Children ON [Children-local].childid = Children.childid SET Children.firstname = [Children-local].firstname, Children.middlename = [children-local].middlename, Children.lastname = [children-local].lastname;

2) Or to use the update query without setting the joins but specify the where clause criteria
like below
UPDATE Children, [Children-local] SET Children.firstname = [Children-local].firstname, Children.middlename = [children-local].middlename, Children.lastname = [children-local].lastname
WHERE (((Children.childid)=[children-local].[childid]));


Would the peformance matter if you are using join vs where clause and which is the best method.