3 similarities between Lightroom and Photoshop are, they are both image editing software, you need to pay to use both of them, and include the basic photo editing tools needed to edit your photos.

3 differences between Lightroom and Photoshop are, that photoshop allows more control in editing, to help you achieve the perfect photo, compared to Lightroom’s more limited editing tools. The next difference is that Lightroom uses non-destructive editing, which means you can make changes to a photo without permanently altering the original file, while on photoshop, if you edit a photo, it’ll alter the original photo, but on Lightroom, you can have the original file, and the edited file at the same time. The final difference is it’s better to use Lightroom for organization, and editing, and photoshop for retouching and layers.

I personally would choose photoshop still, due to the bigger variety of editing tools to my disposal, and the better retouching tools.