union vs or

--- Requirement: Select all bookings that are shared to factory_id = 194592 or supplier_id = 201670 ---

--- Using OR condition ---
explain analyze
select count(*) from inspections_booking ib left outer join inspections_customorgcontactlocation f on ib.factory_information_id = f.id
left outer join inspections_customorgcontactlocation s on ib.supplier_information_id = s.id
where f.org_id = 194592 or s.org_id = 201670


--- Using UNION ---
explain analyze
select count(*) from (
select ib.* from inspections_booking ib inner join inspections_customorgcontactlocation f on ib.factory_information_id = f.id where f.org_id = 194592
union
select ib.* from inspections_booking ib inner join inspections_customorgcontactlocation s on ib.supplier_information_id = s.id where s.org_id = 201670
) as ib