The Wehrmacht and Waffen-SS also "belong to the same military" but I would much rather face the earlier than the latter.
The military is a vague thing... The Marines and Army are two outfits with similar functions and training. It's not taboo to compare their pros and cons.
There's noting wrong with comparing the pros and cons of either branch, but first, we have to understand what thsoe pros and cons are.
Personally, I think both are highly professional and highly technically and tactically proficient warfighters, who have kicked ass in every war they've served in since 17 June 1775.
Their battlefield capabilities almost mirror each other. The Corps is by far the finest amphibious assault force the world has ever known. It's their forte', to be sure. They invented it, they perfected it, it's a science that they understand better than almost anyone.
The Army, on the other hand, has airborne delivery capabilities that are un-matched in the history of warfare. Army airborne and air assult forces can have a brigade of infantry, with all it's support, on the ground, ready to engage the enemy in an hour. That's untouchable, even on the modern asymetric battlefield.
I think basic training for the Army should be extended to the same length as the Corps. I always liked that about the Corps. I also like how their marskmanship training reaches out to 500m (or is it 800m?). I always felt like the Army should train at those distances. They may now, but as late as 200, they weren't. The Army's logistics are head and shoulders above the Corps. What's that saying? "If you want logistics, join the Army..."
We always here about, "Marines this and Marines that", from the Marine vets, but something that I don't think most folks understand, is that alot of Marine MOS's are trained at Army schools. Most of the schooling I received was along side Marines, as well as some Navy and Air Force personel: jump school, ranger school, BUDS, small arms school. While at Aberdeen Proving Grounds, I saw Marines training in all the other MOS course, as well. If I'm not mistaken Marines attend the Army's M-1 master gunner's course at Fort Knox. Someone told me that once, so I dunno.
me, I joined the Army because the Corps doesn't issue a CIB.