Regression analysis vs Weibull

[BreadPigZ]

Hi there,

I am tasked to work on working out a model to project failure rate of product using 2 years of actual failure rate data .

I had tried using regression analysis in excel and using the same dataset with Weibull using minitab but somehow I am getting a higher rate in Weibull

I wonder what's the difference between the two methods and when is the best time to use them

Thanks a lot in advance for your expertise advices