I have made a post here before, but my opinions have changed since then, so I am going to make a more detailed list here.
10 - Zenith
I think the idea of an ultimate sword that is the culmination of your journey is neat. It is also fun to use and has awesome visuals.
9 - Stardust Cell Staff
While Dragon is much more viable, I like Cells more. They are more mechanically interesting, they look cute and also fun to use (something important!).
8 - Nebula Blaze
The dust effect it gives to your character's hand has always been awesome to me. It is also strong and effective, in top of being cool.
7 - Stellar Tune
A friend of mine who loves this weapon made me like this weapon. It sounds and looks nice, its also pink and starry, something I appreciate! Its fun, too.
6 - True Excalibur
Its a close ranged weapon in the stage of the game where close ranged combat can work the best. Its effective, looks cool and fun to use. Simple.
5 - Starlight
It might not be the most effective weapon on its tier, but I like it. Its a very fast hitting rapier, satisfying and fun.
4 - Eventide
I always found it to be better than Tsunami. It has nice visuals (bow sprite looks awesome as well) and its effective even when using an Endless Quiver. Fun to use and effective.
3 - Phantasm
An insanely powerful pillar weapon that is very effective for both clearing out pillars and Moon Lord (my least favorite boss in the game). The bow sprite is awesome, and its concept (a bow charging with phantoms) is no different. Seeing those huge damage numbers makes it much more fun.
2 - Starfury
It is very good for a pre-boss weapon. Has nice visuals and is effective, in top of being a starry sword. I have always liked it and its definetly my favorite sword in the game.
1 - Daybreak
Daybreak is perfect for my liking, exactly what my favorite weapon ever would be. Its a thrown spear and a very ethereal looking one, it explodes, is fun to use, is very strong and effective, and its DoT (Damage Over Time) effect is the best in the game. Additionaly, it is the weapon I used when I first ever defeated Moon Lord. It has a badass name, too.