So, a lot of people are saying "skip mag weapons for lasers", and I'm not seeing it myself. For a few reasons actually.
First, at least currently, before upgrade laser weapons have the same base damage as the mag weapons, but they don't have the bonus penetration value. I'm actually thinking that means they are slightly worse against armored opponents unless/until you hit 3+ shots on the same target, which is where the laser's low ammo matters a bit more. After the upgrade that changes, but I think the after upgrade version is currently the human version of plasma weapons given the requirements.
Second is the cost, which is where I am thinking that the trick is that you can sell the mag weapons when you do upgrade to lasers for a good chunk of what the lasers are going to cost you in terms of money, and both have fairly low resource costs when you start getting regular UFO missions. Compared to the other projects available the resource cost doesn't seem that big to add in.
Third is a relatively recent change to let you capture Cleaner mag weapons... which kind of works against my argument because you can in fact just do that instead of building them yourself and get lighter versions as well. Still using those to fill out your mag rifles while you just build mag versions of shotguns or machine guns seems like a way to tide you over until the laser upgrade.
Now, as for downsides I currently see:
- The mag sniper seems a bit more dubious. The sniper class has a base 10 penetration already, even the laser version, while the mag only has 12. Going straight to laser here isn't as strange of an option to me as the other variants.
- You will be losing some research time to unlock these, and as noted above the Cleaner options can fill out a big role without that.
I'm not sure they are really in the right spot at the moment, but I don't think I will be going to instantly skipping them just yet.