Is any one type of trolling motor better in every situation than the other, my answers is a resounding no. Tiller, Foot, and Remote control all have situations where they are they best. But we only put one on our boats so we have to make a choice.
For me IPilot is the Bomb, I've had mine for 5 years now without a single issue (I had to change battery twice).
The feature I use the least is the record a track, but I have used it trolling and it is hard to beat. Speckle perch/Crappie/Sac-Au-lait fishing, combine record a track with side imaging and you can wear those rigs out.My daughter and I caught 70 in 1 hour by marking way points of schools and then recording our track and just letting the TM do all the work controlling the boat. Trolling for trout in wide creeks in the Suwanee area, shoot I've put some meat in the boat.
Spot lock is a must have for me, the only time I've pulled my anchor out is about 3 years ago when a my buddy forgot his and I lent him mine. Going into some deep water with your small boat on less than IDEAL conditions to fish some structure, I don't know about you but the last thing I want to do is anchor on a rope. A few years back I wore the sheep heads out on Stienhatchee reef when other boats would not even go because I could spot lock the bow into the waves. I have caught so many fish because of spot lock convenience, not mention all the time I have save not deploying and recovering anchor.
Heading lock is pretty good not perfect, its best use to me is to combine it with cruise control and slipped down a creek/channel or creep up a creek/channel. Slipping is actually going backwards at a controlled pace. You engage the heading lock and set motor speed at less than what will hold you against the current/wind and you can slip down a creek or channel. Cruise control is nice to ease against the current up a creek or channel, it can be set in 1/10th of a MPH increments.
Where would I rather have a Tiller, low tide in a oyster bar filled creek. However a remote controlled unit is workable.
Where would I rather have a foot controlled TM, fishing cypress knees for bass. However a remote controlled unit is workable.