Dude, it's your money. Don't ask others what looks better.
The 5.1's are the same, and 4.3 because it's quicker. Longer = more velocity and accuracy.
If it's accuracy that you want, then why do you care about what looks better?
If you want accuracy, then prepare to blow hundreds.
A stock hi-capa is perfectly fine out of the box.
If parts break, you prepare to buy replacement, or upgrades.
Accuracy isn't always on the gun, it's on the person who operates it.