suggestion for best synthesis tool for asic design

[seeker_123]

Hi
I want to know best synthesis tool for asic design. From web i have listed some like
1. Design Compiler by Synopsys
2. Encounter RTL Compiler by Cadence Design Systems
3. HDL Designer by Mentor Graphics
4. TalusDesign by Magma Design Automation

I know it might be difficult to say best because it might depends on what to implement.

still what are the points or features to consider while choosing synthesis tool

thanks