Psionara wrote:What should the weaponry be on a Repulsor? For anti-infantry or anti-vehicles.
Not Fixed/Glued-on. Weapon stats change from edition to edition. People magnetized Predator Tanks as much for this reason as for being able to use the chassis as another Rhino variant. Magnetize the things, or assemble in a way you can swap.
For now, it depends on the rest of your list and what you need more of - but generally speaking -
on the regular repulsor the LasTalon and Twin Linked Las Cannon don't synergize well because of different max ranges. The volume of fire on the Onslaught is arguably better (again depending on what you're missing) and it's rate of fire may make up for a low armor save mod.
On the Executioner - at Toughness 3/4 (most infantry) the Plasma will do slightly but not significantly better. At T5 to 8? 9? I can't remember they'll mathmatically perform about the same. Above that the Laser Destroyer will perform slightly but not significantly better. In the current edition/codex stat-line.