Silent Hunter 5, Steam or boxed version?

[Hylky]

Ive had played the steam version of SH5 with mod's for almost week, and really like it, but now i have change to get my hands for real cheap retail version of SH5, but which is better for modding and etc?

I've had read that the retail version is better than steam version? or does it matter which to choose for nowadays?
Should i just stay in the steam verion? is there any difference?

Thnx!