what is the difference between V6 & 直4 engine

I will tell you the one you said to be excepted
直4 is well -balanced,
V6 is make smaller noise, smooth for the power

Obviously, V6 have more power than inline 4, due to 6 cylinders to 4 cylinders!
any further informations e-mail me!

in-line 4 is less popular now, mostly for small size car
V-6 typically can deliver more power.

The distance from each cylinder of a V-6 engine to the drive shaft is more even/shorter so the efficiency of a V-6 is better than in-line 4.