Thanks for the advice .
I like Todo's extra List level and the fact that it has priorities - and the fact that the iOS app looks great (and I have the impression that are about to revamp their web app accordingly).
It is not very GTD out of the box, though, so I have struggled to find ways to implement things like Next and Someday lists etc, which I think I might be able to manage (with some difficulty), but the things that I cannot for the life of me find a solution to is how to implement GTD Ticklers without having to go and change my user Settings each time I want to take a look at them, or how to make me notice these ticklers when they appear.
And a much smaller but irritating thing - I like having a one-click toggle (star etc) to put things on my "white card" (and unclick to remove it if I change my mind or get caught up with something else); in Todo I need to open the task to toggle the star. A truly minor but constant source of irritation.
Apps for longer-term planning
Anyway, as discussed earlier in this thread, and in other recent threads, I think each user's requirements depend heavily on whether he/she is just aiming to put the shorter-term activities into the app, or is aiming to put longer-term projects and goals in it, too. I belong to the latter category.
Most, if not all, of what I have suggested in this thread is aimed primarily at those who want to include the longer-term major projects and goals etc in the app, and therefore have something substantial to gain by being able to organize their tasks such as to minimize unnecessary repetitive "re-connection of the same dots" during each and every review.
I perfectly understand if those who primarily put short-term actions into their app do not have those needs at all.