Why is hofmann product prefered here?
The Hoffmann product is formed as a major product generally in four cases. They are:


When the ${\gamma}$ carbon is 4°
When the leaving group is poor leaving group  
When the leaving group is bulky leaving group
When the elimination is internal elimination (${E_i}$ mechanism)    


Case 1:

It happens in the example given in the question the hindrance of base in abstraction of proton favors Hoffman product    

Case 2:    

It happens with poor leaving groups such as flourine (based on the carbanion character on the carbon from which proton is abstracted in the trasition state) 

Case 3:  

It happens  in  the Hoffmann's exhaustive methylation reaction where the bulky leaving  group  is a 3° amine group  

Case 4:
It happens in the treatment of a 3° amine with Caro's acid followed by heating and in heat treatment of xanthate esters 

Lastly I want to add that these are general results the yields may vary based on reactant.