These seem to be the only two TD games I don't have, and I can't decide which one and I know their both .99 right now. Just wondering do either of them have an endless mode or survival mode with infinite waves?
Content, gameplay and longevity...Besiegement. It has both fixed and non-fixed path maps, achievements and challenges. It doesn't have survival mode though.
The next version of Besiegement will have an endless mode. I've added it and I'm in the tweaking stages now.