What models would you recommend for forecasting demand for products ( unit movements) and what key variables would you include

Thanks a lot. Data is available so that should not be a problem. What models would you suggest for demand forecasting of each product ( gradient boosting or hybrid deep learning models or ARIMA) and what key variables would you include in the model ( I’d suspect previous sales, price)

What models would you use for product assortment/getting the product range right for different stores