Which below query will work better?

create table #test(id int, name varchar(100))
insert into #test values (1,'aaa')
insert into #test values (2,'bbb')
insert into #test values (3,'ccc')

declare @search varchar(100)= 'a'

--(1)
select * from #test where 1=1
and ( name like isnull(@search,'') + '%') --OR @search is null

--(2)
select * from #test where 1=1
AND ( @search IS NOT NULL AND (name like @search + '%')
OR(@search IS NULL AND 1=1))