sleeve anchor length

hi,

i have a question about the required length when using sleeve anchor

i will be anchoring into bricks, which is around 2.5 inches in height.

Should i get a 3" sleeve anchor, so the "sleeve" will go below the bottom of the brick? Or should i get something like a 1.75" so the sleeve will expand inside the brick itself?

which one makes it tighter?

Thanks.

sleeve anchor length