Just in case you're not aware of the current 3D gamedev industry situation: it's not good. Lots of layoffs happened which means you're competing vs. people who have a lot stronger portfolios and most likely more experience. Prop artist role is very rare, Weapons artist role is probably even more rare nowadays and the bar…
this really depends on what work the studio has to offer to a junior. IMO choose what seems more appealing to you and tailor your portfolio around that so that you get hired to do what you want to do, and if you don't get hired at least you'll have had fun. Realistically you will need both, and there are like... a small…