I assume the moritaka is the regular KU and not the ishime?
I have a Takeda sujI, but only played around with the moritaka blue 2 version (ishime). The Takeda is thinner and flexier, but not as noodly as the old AS ones. The moritaka def feels more solid and stiff. Good or bad thing? Up to you I suppose. That being said flex may not be all that different at 180mm.
Performance should be somewhat similar between the 2, but I do have a preference for Takeda’s AS HT - it seems to hold an edge forever. I drew the whole blade through a piece of bone the other day at it seemed no worse for wear. Did stress me out tho. Food release on the Takeda is nice, the grind causes it to spit cut pieces out instead of sticking to the knife. Assuming you’re not using it for anything other than meat, the zero grind wedginess should be a non issue
I personally dislike the ishime finish. The parts that lose the KU are pretty reactive in a bad way, it turns yellow quickly and darkens with time to an unattractive brownish color. Much prefer takeda’s SS cladding although some have said it’s pretty resistant to abrasion (if you’re looking to thin/mess with the grind).
The one bad thing about Takeda is the silly prices. For some reason they’re significantly more expensive, especially at the longer lengths (which you may want to consider, huge suji’s aren’t as awkward as they may seem, but give you all the blade you need to make one clean cut). Other weird thing is the blade is mounted super close to the handle, I had to change my grip a bit but at 285mm there’s plenty of useable edge.
Keep in mind these are the experiences/opinion of a complete novice, hope it helps with your decision!