wdr3

hi all got dd-wrt on this router but its dd-wrtv24 sp2 6-23-14 want to up grade read that this works well dd-wrt v3.0-r33413 std (09/27/17) but unsure about it. do I go back to stock because its old..... then flash that..... or straight to that or is their a newer or better build??? thanks...