If you're using the term 'Fire Stick' as it should be used (since it's a registered trademark that's owned by Amazon), there are only Amazon products to be considered. The basic model is this one, which has full functionality but the remote can't be used to adjust the volume on your TV. (You'd need to use your TV's own remote control to do that):
https://tinyurl.com/yjzfrhw6
If you want to be able to control your TV with the Fire Stick's remote control, moved up to this model:
https://tinyurl.com/4zmttpdw
If your telly is a top-of-the-range model, with a 4K 'Ultra HD' display, you probably need this Fire Stick:
https://tinyurl.com/3hmy23v4
If, though, you've used 'Fire Stick' as a generic term (in much the same way that people refer to 'Sellotape', even when their sticky tape is actually made by a completely different manufacturer), you might also want to consider Roku devices. See here:
https://www.roku.com/en-gb/products/players