[R] Which is Best function to find Maximum Likelihood Estimates in R?

[chamilka]

I read there are several R functions to get the Maximum Likelihood Estimates
of a probability distribution with the available data in R. For Example...
http://stat.ethz.ch/R-manual/R-devel/library/stats4/html/mle.html mle
{stats4} 
http://stat.ethz.ch/R-manual/R-devel/library/stats/html/optim.html optim
{stats} 
http://rgm2.lab.nig.ac.jp/RGM2/func.php?rd_id=bbmle:mle2 mle2 {bbmle} 
http://rgm2.lab.nig.ac.jp/RGM2/func.php?rd_id=maxLik:maxLik maxLik{maxLik} 
.....
Can I honestly know which is best and how they differ? 

Thanks in advance for your kindness. 

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