Looking to replace my flush trim router bit.

[James Evers]

I've been using a 1/4" double flute shank Bosch for the last couple of years , but its not looking good heavy burning and dulling.

I want to go up to a 1/2" shank with dual bearing bits for more stability and durability. I am wondering if it would be better to go with a three flute or two flute bit?

All of my work is handheld using 3/4" or 1/2" baltic birch ply. I plan to get a whiteside bit since the straight bits I have from them have been so good for me.

[Prashun Patel]

The best is a spiral bit, but they can be pricey.
You can get 'shear' flush cutting bits which are a cut above the standard ones.

[Clarence Miller]

I concur, I didn't see the point of paying extra for the spiral until I used one. The 3 flute straights did a good job but the tear out and chatter drops to almost nill with the spiral. And it pushes much easier as well.