Please help with Marth build i cant decide

There isn't enough of a difference to give you an objective answer. You mentioned the valid cases for both choices... now it's just whatever you like.

Go the second one, its a boost to attack and speed.

Use the first. Better to have the larger range on the buffs.

I would go with the one with drive speed and drive def since it synergizes extremely well with his Falchion.

I would go drive instead, I find it better to keep the buff range consistent (rather than drive on his sword and spur in his skills.) So I would do the first one. Hopefully we'll have a drive attack or drive speed seal, or maybe drive atk/spd. I would use Moonbow instead of Draconic Aura though.

I’ve been using a build that’s pretty much the 2nd one for the longest time, but once the refinement came along I switched to the 1st and haven’t looked back ever since. While the boost for the 2nd is slightly better, you have to be adjacent to allies. This might not seem like a big deal, but as someone who’s used Marth for practically the entire time I’ve been playing this game, I’ve found it much easier and convenient to just use drive skills. There’s a lot more flexibility with drives, while the other skills require very specific positioning which can become problematic.

Drives. Bond skills are too impracticle not to mention you can easily buff more units at a time.

Honestly they're really similar anyway. I'd stick with Moonbow or Aether to etiher boost his damage consistently or have more arena score, since Marth isn't the most potent combatant. As for whether you go with Drive skills or Spurs, that's entirely up to you based on your positioning as Drive skills have more range to work with. They'll probably release a Drive Atk or Drive Spd seal later on, anyway.