HOB overflow. Which one to go with?

So like the title says.

I'm wondering what HOB overflow I should go for. I have a 25g tank and just a mag5 ATM. Using an AC70 as hob flow right now but wondering what hob overflow would suite my system the best.


I know someone has more experience and insight on this then me. Please help me out as I wanna setup a skimmer and sump on this setup.


Thanks
Q