I mix em up but more often than not I start with a knee slice and go from there.
If double under doesn't work for me, I go for pressure passing. Andre Galvao had an amazing video not too long ago saying that standing opens you up to DLR and a ton of sweeps.
I'm a fan of both but have been working on pressure passing recently, here are a couple of good options from Murilo Santa.
Stacks & Over Unders - https://www.youtube.com/watch?v=wujuSIjshSw
Pressure Pass Chains - https://www.youtube.com/watch?v=rAWqGfDm0x4
My standing pass success rate has gone up significantly since I've been starting to look for the honey hole entry from standing. Just thought I'd throw that out there. :)
Personally, I love standing passes and I am finding more and more success with them. Love Orchards sideways entry to kimura! Honey hole is right there too.
When I am rolling with lower level opponents, I pressure pass, especially if I feel my defense is stronger than their offense. I want to slowly crush their will and dictate everything until they give me a sub. I sometimes even give away arm bars (from full guard) to stack and pass, it allows me to really drill defense, and create good timing, which I will later need in comp and against top level opponents. Plus its really frustrating when you realize you got baited, and they often start to make mistakes or fall apart and give away submissions.
But.. if I am dealing with a strong opponent, now I am looking to posture, stand and pass asap. I don't want to let them start dictating the game, as they inevitably always will because of their skill level. The more I can stay dictating the game, the more of a chance I feel I have to launch on my path. I don't mind swamp walking a few times either to avoid letting them set up DLR, spiral, etc. Just pressure hard on the turn around and get in their face before they reset. (Won my match at GL training camp off a swamp walk, right into a "flying" marcelotine.)
If I am standing I personally also feel less predictable because my body and momentum are not connected to my opponent as it would be in their guard if I try to pressure pass. I feel more vulnerable to sweeps and counters when pressure passing.
One begets the other. If he is leaning against the front door to stop your entry.. try the backdoor.
What do I prefer? A successful pass. How? Irrelevant.