first :i think there's no best defense againts all attack tactic...
next : look his 5 last games or all games in this season
next : analyse your opponent,what his best scorer and weakness
for run and gun i think just 2 best option defense tactic
- man to man : if you have strong outside def skill,jumping skill,blocking for your small man player and your opponent doesnt have good big man
-1-3-1 zone : if you have nice statistic steal every game...and off course this tactic for his big man who have good jumping shot and inside score too