If you want to stay with the 3.5.x series due to modifications not being compatible with 3.6.x then you should upgrade to 3.5.5 as this fixes a lot of bugs present in 3.5.3 and 3.5.4
From an end user perspective, there are not that many changes between 3.5.x and 3.6.x apart from multiquote and the AJAX stuff. For admins though, there is a lot of things in there now as stock which required modifications previously, and many more bug fixes.
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