I don't like either as they keep underperforming the ASX200...

I don't like either as they keep underperforming the ASX200 index for the past 1, 3, 5, 7 and 10 year periods so

why would you bother ? 
BKI performance has been particularly abysmal,  so if I had to choose one of those 2, it would be AFI.

From their own websites :  

     to Sep 30    2018                    1 yr               5yr                10yr                 14 yrs

ASX200 accum index                  14%              8.2% p.a         7.8% p.a       8.4%p.a
AFI  share price + dividends        11.8              5.7                  6.9 

AFI  NTA growth + dividends        12.5             6.5                  7.5
BKI  total shareholder return        - 3%            4.5%               6.9%               8.1% p.a

BKI  portfolio performance            8.6              4.8%               6.5                  7.5% p.a       

IMO these funds do not deserve the venerable status that many people regard them

and there are much better options these days.