The price for all 3 are pretty similar. Poly CL is slightly cheaper but will be staying in December so construction might be an issue. Not sure how the Hawaii building would be affected by noise etc. Traveling with 3 kids under 5 and mostly hitting Mk, maybe one day at Epcot. I am thinking either CR TPV (closer to monorail) or BLT 1 bdrm TPV (more room to spread out but further from monorail). Thoughts?
I have stayed at all three of those
CL is fun but what are your sleep arrangements? The one bedroom you can tuck them all in the sleeper sofa and chair and relax in your own room and balcony. We didn't have that option when our kids were small. Now that they are big we have to do at least 2 baths since teens.
GV is fine at poly because you get the awesome space of the lounge and views anyways. I don't think noise will be bad. I was there during construction in April and may and it was fine.
Cr MKV is really awesome

it is convenient to walk to MK and one stop away from transfer to Epcot monorail.
Truly I go through this myself, which one
As a mom what will work best for your family??
Convenience of free snacks and space of lounge? the convenience of being in the building with food, shops and monorail? Or space to move around? Oh ya I never thought I would but I use the washer/dryer a lot!!
There is no perfect , each will offer something great and only you can decide.
I lean to BLT first for you and poly 2nd. You and spouse can take turns in the lounge while the other puts kids to bed. (?)
Good luck deciding! They all will be great once you are there!
Just reread your post, you have to cross a bridge to access monorail which is a little farther but if you walk to MK then it is closer. This is nice if returning after fireworks/ parade and especially in mornings. You can leave 20 minutes before rope drop and get there in time for sure! Taking the monorail will be longer.