Most gutters you get from a professional company these days are aluminum but there are many more questions to be asked. Ask about pitch, how their corners are put together, sealants, the size of downspouts and how the water will flow.
A good gutter professional will not only be able to assess problems with your gutters, but will also understand water hydrology. Most gutter professionals should have an array of gutter protection options. If they’re offering a one-product-fits-all solution, you would be well advised to thank them for their time and show them the door.
Skip these steps, and your new gutters may end up costing you dearly for basement repairs.