Aluminium clad resistors vs pcb heated bed

Hello, im building a 3d printer and im having a hard time to choose between a normal pcb heatbed or a heated bed with aluminium clad resistors...
Can you guys give me some opinions and recommendations on one of them?

thanks ahead, dbarzel.

Resistors heat faster because their resistance is constant. They need mounting on an aluminium plate which gives good heat spread but is heavy and it is expensive to get a plate that is guaranteed flat enough.

PCB are lighter and cheaper but struggle to get to high temperature because their resistance increases as they get hotter. They get hotter in the middle than the edges.

I use a mixture of both as there are pros and cons. Easier to get better quality prints with a lighter bed if it is moving but less easy to get ABS to stick at the edges.

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[www.hydraraptor.blogspot.com]

Or...
Use a silicon heating pad like used in the Heated WolfBed.

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Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

nophead, i would like to know what board do you use to support that kind of "mixed heatbed"... i am planing to use megatronics v2.0. thank you very much for your help!