I have a lot of experience with St. Croix rods now as well as with G. Loomis, so I can help you. Off the top of my head, I own an Avid 7' MHF Casting, Avid 6' 8" MXF Casting, Avid 6' 8" MXF Spinning, Avid 7' ULF Spinning, Avid X 6' 6" MF Casting, Avid 6' 9" MLXF Spinning, and I have an Avid 7' MF Casting on the way.
I also own a St. Croix Legend Elite 7' MF Spinning, Legend Elite 7'1 MHXF Casting, and I even own a St. Croix Victory 7' 3" MXF.
One of the best models out of the St. Croix Avid line is the Avid 6' 8" MXF Spinning. The Avid 6' 8" MXF Casting is just as good. Interestingly, the casting version of the 6' 8" MXF has a slightly more sensitive and lighter tip than the spinning version even though they are the same power and action spec wise. They are both good rods and among the best models in the Avid line, in my opinion. Light, balanced, well designed, reliable, and alright sensitivity.
Although it's not what you're looking for, the Avid X 6' 6" MF Casting feels like it's the lightest, most sensitive, and the best balanced out of all of the Avid rods that I have. The aluminum oxide Kigan guides haven't given me any issues yet, but I just don't like mini guides when throwing weightless soft plastics. The worst out of all of the Avids I own is the Avid 7' MHF Casting rod. It's tip heavy. However, I've finally come to like this rod now somewhat because it works well as a spinnerbait, chatterbait, and swimjig rod. It can do alright in a pinch for jigs, and it's acceptable as a pitching rod for 3/8oz weighted Texas rigs, but the sensitivity is lacking for my preference when it comes to bottom contact baits, and it's not pleasant for these techniques because it's tip heavy.
Out of the rods you are thinking of choosing, go with the USA made Avid 6' 8" MXF Spinning. It's the most comfortable spinning rod I own. I like the foregrip on this rod. Fits my hand like a glove. That's the best part about this rod. In fact, I like the Avid 6' 8" MXF more than my twice as expensive Legend Elite MF Spinning, but that's a story for another time.