Good length of course. When you are in that situation, you have to trust yourself and your bowling. No need to do any type of experimenting. If you bowl an inswinger, you may stray (like many of our bowlers) and then either be called for a wide or the batsmen could easily flick it off his legs for a gimmie 4. Line and length is always the answer. If a batsmen can pick the gap with a ball at good line and length, then all you can do is tip your cap.
"When the power of love overcomes the love of power, the world will know peace." -Jimi Hendrix