i also read somewhere that decrypt software has the most difficult time breaking the code for pattern lock. on the other hand, someone pointed out that our greasy fingers might provide a big fat clue to what the pattern is. i go with pattern lock anyway, because i figure i swipe, pinch, zoom, etc., enough in general to smear the whole screen!
for greater security, i bought cerberus off the play store. you can set it up so that assuming the phone is not completely dead, you can text it to sound an alarm, take a photo of the person who tries to silence it and even wipe your whole phone. i can verify that the alarm and photo part work; i did not try to wipe my phone, though. the one thing i noticed is that you have to be careful not to enable a pop up that permits your text messages to appear on the screen even when the phone is locked - if you do, your cerberus secure code will appear as part of the text message! so caveat emptor.