Hi @paulhenry3443 , thank you for reaching out! Binoculars sound like a great gift for your brother. Since the primary use of the binoculars will be for hiking, weight should be a key consideration. You could easily go with either 8x or 10x magnification but if you're having trouble choosing between the two, I'd go with the lighter pair. Also, if he does any birding, an 8x magnification will have a wider field of view.
Thanks again for reaching out!