Get SB Pro PE. the first SB you mentioned is locked at software mode graphics 640x480, 256 colours, and visually is totally, completely, hopelessly outdated, due to it's high age. Functionality also do not compare, although SBP1 still is the number 2 in the arena, behind SBP-Pro. If money is a porblem, SB1 still delivers a blow in gameplay, though. Back then it redefined tank simulations on computers. SBP-Pro takes all that to completely new levels, and then adds much more.
The upgrade now implements a new data format for 3D models, so many old skins existing will not normally fit anymore. But the good news is that the skins for the vehciles are moddable, yes, separated for autmun, winter and spring/summer.
In the SBP ressources sticky on top of the forum list you find a link to a screenshot thread.
http://www.subsim.com/radioroom/showthread.php?t=97188
Pictures of the new vehicles you can find at the main and in the mod-forums of eSim, and here (beware the different dates!)
http://www.steelbeasts.com/sbforums/...p?g2_itemId=15
Steel Fury and Steel Beasts Pro PE do not really compare. The latter plays in a league of it's own. That's why the military trains with it and pays 18000 dollars per 10-seats-licence. Plus expectionall quality standard, worldclass support and omnipresence of the developer in the support forum - since roughly ten years.
If you want realistic tanking and tactics, you can't go wrong with SBP, trust me. It's a superior choice.