[arch-haskell] Arch packages and/or Cabal-install ?

Hello... a newbie question (not installed Arch yet, only decided to give it a try... new to this list, too) : It seems that haskell packages on Arch can be reliably managed by either cabal-install or arch packages. I suppose that mixing both is is not recommended ? e.g. using an arch package if it exists else caba-install, or obtaining one by arch yaourt but then upgrading it by cabal install... So, what would be the drawback of installing as arch packages the minimum to have GHC and cabal-install, and then using exclusively cabal-install to install and upgrade haskell stuff ? What does arch packages bring more than cabal-install, since both manage dependences ? Thanks, and sorry if the question is naive... Eric