Best method to keep totals

[Tompkins Neil]

Hi,

I'm developing a system whereby a manager gets assigned points based a
certain number of factors which are saved alongside a football result.
 However, I also want to keep a total for each manager.  My question is it
best to just have a query that uses SUM to total the managers points gained
for each fixture participated in ?  Or should I be looking to have
a separate field which is the calculated total for each manager ?

Thanks in advance for any advice.

Cheers
Neil