SQL & PL/SQL

What is the difference in using
an Inner Join as compared to an Equi-Join?

If I need to join three tables using inner join

select t.trade_id from trade t 
     inner join product p 
     on t.product_id = p.product_id 
         inner join trade_key k 
            on t.trade_id = k.trade_id 
            where t.trade_status in('OVER') 
            and p.product_type in ('Bond') 

Now I am using equi-join for the above:

select t.trade_id from trade t,product p,trade_key k
where t.product_id = p.product_id 
and t.trade_id = k.trade_id 
and t.trade_status in('OVER') 
and p.product_type in ('Bond') 

Arent both using inner and equi joins give the same result?

So when do we decide to use which?