How much do the stats items have give to the overall offence ability ?

currently i have a sword with 47.3 dpr and +1 def an alternative would be 38.8dpr and +2 attack power

in addition my fighting style is fast paste offensive so +2AP should suit me better, but then again 8.5dpr is a huge upgrade so i'm using the better dpr weapon

then again the + abilitys made me wonder how they work and what should i choose if the dpr difference was only a little