The advantages for inline are:
-streamlined shape
-easier to handle due to less torque
The cons:
-fewer horsepower than the radial
-easily damaged
The advantages for radial are:
-more horsepower
-very durable
The cons are:
-little harder to control due to the high torque
-less streamlined then the inline
But there are exceptions to this, such as the high power of the Sabre inline engine on the typhoon/tempest, or the low power of the Zeke's sakae radial engine
Basicly, its been an arguement for years which one was better, and pretty intresting which contry pick which.
Japanese=mainly radial (D4Y and Ki-61 are exceptions)
British=mainly inline
U.S.A.A.F.=mix of inline and radial, but only radials for bombers
U.S.N.=mainly radial
German=mixed
Russia=mixed
Hope this helps.
