Hmmmmmmm,
Tied or untied tickling? This is an interesting question.
I think it all depends on what type of tickling is happening. If it is playful and spontaneous, and isn't going to last all that long, wrestling and rolling around is really fun without tying. If I'm being tickled for a period of time by an evil ler, being stretched out and tied is also fun. I like both.
Either/Or. Totally depends on the circumstances for me.