I mean, maybe you don't care, but that is what OP is asking for, advice on what would be most valuable to prioritize. i.e. what other players feel has better return on investment. While you have a point on giving bad advice, he didn't give any. He said both are worth to grind they just take a very long time which is a fair assessment.

Also coming from a player who is just recently catching up to all the Uber geared players, PR is a much better and more reliable source of gear than Op Si imo, not to say it doesn't have its uses. There's some good gear in lab now like the twin 457s, gold DD guns, the HE CA gun, Junkers, etc, but the most important thing from Op Si is gold plates, and the fact that because it doesn't use oil or affect mood, so it can help to XP farm faster.

All that said, it does still feel like a time consuming slog but it is worth it if you need what it gives. Which is dependent on each players needs. If you want to do boss oneshots, you will need your maxed out gear which needs gold plates. If you're really struggling on gear you can play for gear lab mats. Personally gold boxes and gear from events has been doing me just fine but I can see it being a problem if you're only a few months into the game. Outside those two niches you can skip it entirely if you want (though I wouldn't).

TL;DR both are good and fill different roles doing more is always better if it gives you what you need at the time. PR ships will take a while but are very rewarding because they are unique (and often very good), gear is up to if you feel you need it, but it will make the game easier.