He is much more accurate compared to Starc, but he just bowls the same stuff over and over again. He'll be awesome on pitches with movement, but on flat pitches he'll be made to look average just like Starc.
Both Patto and Starc need a good bouncer and in general just more variety. Starc also needs more control but the advantage he has over Patto is he has a killer inswinger which he can exploit on occasions.
Boult is the better bowler now but Starc has more potential if he could develop more skills.