help with unit root testing!

Hello!

After reading several websites, i still can't be 100% sure when chosing between none, Intercept only, Trend only and both (trend and inercept) for unit root testing. So, i will really appreciate any suggestion when choosing between the models mentioned above, especialy when working with the next tests:

- ADF
- Phillips - Perron
- Kpss
- Zivot - Andrews

looking forward to your help.

Regards,

Joel