I'm guessing, from what the last few posts have said, that you have bought your rifle? If so, then my comments won't do you any good, but maybe they'll help others.
The big loop 92 (like that 45 on the bottom) are FUN. They are. I play John Wayne, and spin it. It's just neat.
Slow as hell, though, when you are shooting it. Because of the size of the loop, your hand has to move about an extra inch and a half, in both directions, when working the lever, and that just slows you down. The standard lever, like is on that 357 on top, is much quicker. The 4 extra inches of barrel does not make the gun any less handy, and gives you another two rounds - 10+1 vs. 8+1.
Soundguy has said, a couple of times, that he has a Rossi in 38. Never heard of one of them. Rossi is a 38/357, at least all of 'em I've seen. And they work with both. Mine has fed everything I've put in it, from empty 38 brass to full-bore 357s. Marlin, on t'other hand, is a 357. They can be kinda picky about feeding 38s, unless you have some work done on it to fix that, and then they can be kinda picky about feeding 357.
Colt used to make a pump rifle. The Lightning. Came in 44/40, 38/40 and 32/20. It wasn't a really good gun. When I worked, it worked fine, but it often did not work, and it was hard to work on. They discontinued it. Cowboy-shooting rules allows lever guns, so several companies make/made copies of the Colt Lightning. Pedersoli, in Italy, Taurus in Brasil and US Fire Arms, up in Connecticut. These new copies come in 357, 44 magnum and 45 Colt. They are all expensive, and none of them work very well.
The Mares Laig is a cute toy, but not a practical gun. It would NOT replace a pistol. Getting one and putting a full-size stock on it, now - THAT would make a nice short gun. You'd have to paper it as a SBR, though, and pay the 200 dollar tax.
In 30/30, you pretty much have a choice between the Winchester, at 6 pounds, and the Marlin at 8 pounds. The Marlin does not kick very hard, but it is heavy as hell to tote around. The Winchester is much nicer to carry, but because it's so light can really do a number on your shoulder. And whichever one of those you pick, it's only 6 rounds.
I've heard bad things about both of the guns, lately. Rossi was bought by Taurus, and Taurus makes crap, so Rossi has gone downhill. Marlin was bought by the new owners of Remington, and since the buyout, Marlin has gone downhill. So sayeth the web-gossip.
I'm just glad I got all mine several years ago.