Are power swords a good idea on such a bad frame? Might be better just to pack more Storm Guardians, if the math works out.
2 Storm Guardians with Power Swords is equivalent in cost (pretty much) to 3 Storm Guardians with Chainswords. How do these options compare?
Cost
3 Guardians with Chainswords costs 10% more than 2 Guardians with Power Swords
Effectiveness vs Marines
2 Guardians with Power Swords vs Marines: 4/3 hits, 4/9 wounds, 10/27 wounds post-save
3 Guardians with Chainswords vs Marines: 4 hits, 4/3 wounds, 4/9 wounds post-save (12/27), 20% more damage
Effectiveness vs Orkz
2 Guardians with Power Swords vs Ork Boyz: 4/3 hits, 4/9 wounds, 4/9 wounds post-save
3 Guardians with Chainswords vs Ork Boyz: 4 hits, 4/3 wounds, 10/9 wounds post-save, 150% more damage
Effectiveness vs Guardsmen
2 Guardians with Power Swords vs Guardsmen: 4/3 hits, 2/3 wounds, 2/3 wounds post-save
3 Guardians with Chainswords vs Guardsmen: 4 hits, 2 wounds, 4/3 wounds post-save, 100% more damage
Seems like "more Guardians with chainswords instead of aeldari blades" outdo Power Swords, price for price, on average, against most typical troops.
So maybe 10 Storm Guardians: 8x Chainsword, 2x Flamer?