I'd say it depends on how much you're about to pay for it and which a/c you'd like to fly.
I bought the Iron Cross edition myself, which was a bit daft because I only fly the RFC planes. The free download plus some DLC RFC planes would've been more sensible for me, but I bought it about a month before they introduced the free download. Typical!
But, RoF is an excellent sim which I tend to fly offline mostly. The career mode is excellent. Ditto the campaigns.
Download the free version, then buy a/c as you see fit would be my take on it, unless ICE is going cheaper than it would be to buy all those a/c.
Just do the sums and see which works out best for you.
