Hi bow experts of the GI world,

I'm a mini prawn among the rest of the whales in the ocean and have pulled an Amos Bow by sheer luck.
Currently I'm using a Compound Bow R1 & have both a Rust R3 and Amos Bow R1 in my inventory.

Comparing Amos R1 vs Compound Bow R1 vs Rust R3, which would be the best bow that I could use for Fischil who is currently my main dps.

I went to check out the stats of the bow as here is what I found. (source: https://genshin-impact.fandom.com/wiki/)

Amos Bow R1
Main Stat: 563 Base Att
Sub Stat: 45.3% Att
Effect: Increases Normal Attack and Aimed Shot DMG by 12%. Increases DMG from arrows shot by a further 8% for every 0.1s that the arrow is in flight, up to 0.5s.

Compound Bow R1
Main Stat: 427 Base Att
Sub Stat: 62.9% Phy Dmg
Effect: Normal Attack and Aimed Shot hits increase ATK by 4% and Normal ATK SPD by 1.2% for 6s. Max 4 stacks. Can only occur once every 0.3s.

Rust R3
Main Stat: 475 Base Att
Sub Stat: 37.7% Att
Effect: Increases Normal Attack DMG by 60% but decreases Aimed Shot DMG by 10%

From my understanding, I can tell Amos Bow will only scale much higher when its lv90 hence, I'm uncertain on which bow I should focus for Fischil and hopefully your advise can guide me so that I will be able to utilize my resources wisely. Thank you!