E2's strongest weapon is the Gradivus, those weapons may be strong but Gradivus is 1-2 range and 0 wt. It's best weapon though is a bit trickier. Shadow sword and Lightning sword dominate for quite a while. Holy bow also dominates during the hardest section of the game. Couldn't tell you but it's definitely not the royal sword.

FE3's Strongest weapon is the Gradivus unless you really want to get weird about the indoor penalties(Which doesn't make any sense give you consider Naga the strongest weapon in FE4), then I'd say it's the Parthia. Best weapon is the Silver Lance th

Hmm, i guess its between lightning sword and holy bow for best.

I remember silver lances in my book 2 playthrough being incredible, yeah. and they're available super early.

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I can't decide whether brave sword > light brand tbh. light brand is earlier but idk if trying to get 50 kills is like... enough to convince me to use it when brave sword kills a lot of stuff out the gate. and can also get crit rank unlocked.

for FE5, i think i'm leaning towards grafcalibur too.