yes, mct does provide latest build of w10 (1511, 10586). previously, it was reverted to old build due to identified bugs (news can be found online). after a day or two, bugs were rectified, and ms restored the new build for users to download.

a lot of users only read the first part of the story and didn't follow up for updates, hence the confusions.

afaik the main differences between isos from mct and techbench are:
1. mct only provides downloads for w10 and w10-n, while techbench provides w10 single language also. (this is for those whose stock os is a single language version)
2. mct provides install.esd, while techbench provides install.wim. for normal users, this is not important. the difference is minimal.