It all depends upon what you intend to use the primers for. Each method is going to have its own design parameters, such as for amplifcation vs sequencing vs mutagenesis etc. Generally if you look at the instruction manuals for different kits to do the experiment you wish to do, they will explain the optimal design of primers for that application.
To add to Michael's point above, what is your application? Genotyping is different to expression analysis. MicroRNA primers are different to coding gene mRNA primers etc. There is no one-size-fits-all answer here.