Albert_Fish said:
Of these books which do you prefer and why?
Dragon Star
D20 modern
D20 COC
Spycraft
D20 traveller
Whoa... touch call. Three of those books are all time favorites of mine. Dragonstar, Spycraft, and D20 Traveller all rated 5's from me. It's almost too close to call, but I would put them in the order of:
Spycraft
D20 Traveller
Dragonstar
Followed by D20 Modern and D20 CoC (both "4's")
Spycraft and D20 Traveller are both great books that capture the subject matter well and make great resources for their target genre. I'm letting spycraft edge out d20 Traveller only because I can think of one thing that sort of bugs me about spycraft (departments) but two things that bug me about T20 (stamina/lifeblood and animals). Those points don't bug me enough that I would change them, but I had to make the call on something.
Spycraft streamlines the d20 system rules a bit and adds some of its own highlights like action dice. The gadget point system does a nice job of mapping how neat your superspy toys are to your level. Overall the book is well considered and well written.
D20 Traveller is a "one stop shopping" compendium for science fiction gaming. The career path system adds a certain realism and depth to normal leveled chargen, and the classes fit the genre well. The huge book has tools for almost everything you need in a far future sf game, including starships, vehicles, world generation, encounters, and so on, and the whole is setting-light, permitting you to use it for your own spacefaring setting.
Dragonstar acheives it's objectives well, namely to adapt D&D to high tech vice inventing a new d20 system from scratch. If you want high tech in D&D, this is the book. FWIW, I feel as if it does a better job with some modern weapon rules than d20 modern or spycraft, but the armor thing bugs me a little and it is not quite as stand alone as the two foregoing books.
d20 modern is a flexible, adaptable system. It has a bit of a generic flavor to it, too generic for my tastes. Generally, if what you are looking for is well handled by another system (like say d20 Traveller or Spycraft) you are better off with the more specific system, but lacking that. d20 modern is pretty good. One of its major downfalls, IMO, is discarding the innovations of d20 Star Wars RCRB. The VP/WP system, armor, and NPC classes of star wars has it all over d20 modern when it comes to representing modern/ultramodern characters AFAIAC. Further, the books primary support is contemporary fantasy, so it is less well supported if you are looking for something else.
d20 Call of Cthulhu is a great book -- sort of. That is to say it is a much better supplement than a game, IMO. The mythos creatures, GMing chapters, and special rules (magic, sanity, etc.) are pretty decent. But the base chargen is pretty bad IMO. Characters select a profession that defines their skills, but they also select either offense or defense option which is parallel to class. The problem is that the options do not cover the gamut of characters -- I can easily think of characters who would be good at both offense and defense, and characters who are good at neither. I recommend if you want to play CoC using the d20 system, using the mythos material, magic rules, and sanity rules (which are pretty adaptable) from d20 CoC, but use another d20 system game such as d20 modern or spycraft for chargen.