Personally, I am leaning towards stella architect as it offers engaged model based apps Thus a user friendly simulation ! However, I would love to take your inputs on the matter for I am still a SD beginner ! Stella Or Vensim ?
Both software are good for simulation purpose. Your ability to develop an SD model for your problem of interest will determine the results from each of the software. I will like to encourage you to stick with Stella as you have started developing yourself in its architecture.
all such analysis begins with a problem structuring phase for which you need a way of visualy engaging the problem owner and other stakeholders in building an intial qualitative
all such analysis begins with a problem structuring phase for which you need a way of visualy engaging the problem owner and other stakeholders in building an intial quallitative SD model -Stella is good for that
in terms of running different scenarios involvng more than just time dynamics you need to have an SD+ approach involving other types of model