Package versions, bundled software, & uninstallers

I know we're not supposed to ask questions here, but I thought this was a more fitting place since I'm not just looking for answers, but I think the answers need to be in the wiki or even in Chocolately itself, so others can find them. I've searched high and low and haven't found any information (or, for the first question, any that made sense) on these things.

1) Many packages have multiple different versions, i.e. (Install) / .install, (Portable) / .portable, and regular (no tag). Chocolately doesn't explain at all what the differences are, and the limited results I found that discuss it do nothing to clear up the issue. So for many of the programs I installed, I didn't know which version to use, and as a result I have no idea if I installed the right one. Could someone explain this in layman's terms?
2) I couldn't find anything regarding whether any of the packages might contain bundled software (PUPs/adware/toolbars/etc). Considering some of the programs included in Chocolatey contain such crapware in at least some versions available for direct download, if Chocolately is using the same installers then it would be possible to get ones with this stuff, and since Chocolately installs are automated, you wouldn't be able to check for it or opt out.
3) Does Chocolately just use the programs' uninstallers, no different than if you manually installed them then uninstalled them with Add/Remove Programs? Or does it work like Linux package managers, where it tracks everything done by the installer so it can do a more thorough job during the uninstall? IOW, is there any difference at all between uninstalling a program with Chocolately vs with Windows?