Locks that work

Looking for a primary lock to lock up a Dolan pre cursa around Edinburgh/occasionally SW London deciding between onguard brute mini or abus 401 mini? Not really wanting to spend above £40 if I don't have to, anyone me with advice on either of them? Can't find too many reviews on either. Thanks.

Should have said, bike will be locked up for short periods (couple of hours at a time) around the city during the day and secure bike shed at night.