Can't say finance falcuty in LBS is better than LSE since I never compare between them. But students in LBS are generally very experienced and many had top IB or strategic consulting experience and you can learn a lot from your classmates. As a result, similar to LBS MBA, LBS MiF can join top IB starting from associate level. MiF in other universities tend to have many fresh undergraduate without W/E, and many of them have to work from analyst level in IB.