Melee or guns?

[Fang]

What's lore accurate according to the book, because i saw the 1984 movie and they have lots of guns, but the recent films are mostly swords.

[Yhtill]

Both technically. With no comments as to the 'quality'of the game mechanics, shooty-shooty then stabby-stabby is accurate. I mean, if you can put the enemy down with ranged, more fun even faster. Also, a lot is situational. No time to shooty-shooty? Flip on a shield and stabby-stabby.

[Certitude]

In the books, the Fremen use both projectile weapons and melee, since shields are inadvisable to use in the Deep Desert. Assault troops and VIP's use shields, and given that the shield would reflect the energy back at the shooter, most Great Houses opt to not issue laser weapons to most troops (since the nuke effect would go off shooter at the shooter's location), though they have the tech and use it on occasion on other worlds.
Baron Harkonnen uses "ancient" (modern era style) artillery to defeat the Atreides forces in the aftermath of taking Arrakeen, when the surviving Atreides forces hide in caves, by shelling the cave entrances until they get stuck under cave-ins (the shields protect from both the initial blast of the artillery shell and the collapse of the cave, but not from the slow pressure that follows) and gloats about it, but since we don't have that level of terrain deformation, I wouldn't expect to see that ingame.
All the Great Houses have atomics and use them to deter their use by any of their rivals, since none of them want their homeworld or industrial centres destroyed.

In the books, the most common types are firearms are not too dissimilar from modern chemical-propellant ballistic weapons or railguns (ie subsonic or barely supersonic, firing small projectiles or flechettes), but they do also have sophisticated and specialized anti-shield weaponry with retarded, multi-staged sabot-like rounds (quickly gets to a shield, slows down dramatically to get through the shield, then accellerate again to pierce armour), as well as both thrown explosives and drones (hunter-seekers) that are either like suicide FPV drones or like MCLOS missiles (like the AT-3 Sagger/9M14 Malyutka), since any semi-automated guidance system would violate the laws against AI (thus heat-seeking, semi-active radar guidance or laser-designated guidance systems are banned).
The Mentat turret is technically not lore-friendly, since you just deploy it after which it picks and fires upon targets on its own; a lore-friendly variant would have you manually control it instead, like the hunter-seeker ability.