Man, Will- You're LOOKING for trouble aren't you? You might as well ask "What's the best religion?" or "Who has the best mother?" Your chances of getting even two people to agree would probably be just as good.
However, I'm game enough to venture a thought or two. Since the question is pattern we'll avoid the whole 'ghillie' discussion and suppose that you are asking about printed camo.
Anything that breaks up your silhouette without creating contrast will make you less noticable. The old-fashioned prison stripes seen in movies might break up the silhouette a little, but the stark black and white was intended to draw attention. Not to mention that horizontal stripes make short guys like me look fat. Generally, whatever looks the most like what is around you is going to be the most effective. The old U.S. military six-color desert camo (chocolate-chip) worked fine in the rocky deserts of our own south-west, but was too dark for the sand, sand everywhere saudi desert. It was replaced with a three color, low contrast pattern. Do the Canadian armed forces use the same DPM as the British? I'm not sure, but it seemed to me that the British brown-green-khaki pattern was just toned down to a dark khaki-khaki-light khaki version of the same pattern for desert use. Both seemed to be very effective in the appropriate environment.
Here in the mixed-mesophytic forests of the eastern prairie, we have deciduous hardwoods with comparatively rapid successive understory (sorry, one of the few things I remember from college and I use it every chance I get.) Which means the leaves all fall off in autumn and the brush is armpit deep. I only wear camo in the hunting season which, for me, is september through january. Sometimes the leaves stay on longer or there is very little snow, so I like to wear Realtree All-purpose Grey. I don't own much camo with alot of greenery in it. If there are leaves on the trees, they will help conceal me. If the trees are bare, I look less like fresh browse. I choose the grey over the brown because the sun never seems to shine on a day that I manage to go hunting. I'm sure my quarry are unimpressed by the amount of T&E I put into dressing for them, although I know hunters to whom it is anathema to mix camos- "Mossy Oak pants with a Trebark jacket? The animals will laugh at me!" I've canoed the wilderness waterway of the everglades, and looking at the tangled trunks of mangroves standing in tannin-stained marl far beneath the canopy, I think I'd go with the A.P. xtra-brown if I had to hide there.
But, I ramble. Just think about where you expect to be and what time of year, what you are hiding from and what it can see (or smell, or hear, or feel), how actively you are being sought, what you will be doing while hiding and are you hiding day, night or both.
There are scores of commercial and military patterns out there. Probably there are several that would serve well in the same environments. If you really want an anytime, anywhere camo, I guess you could simply wear "earth-tones" in neutral shades and/or subtle patterns, plaids or paisleys. If you want to pack for all occasions, you could make your heavy coat white, your rain gear grey or OD and just try to match your gear and clothing to the general conditions in which it is likely to be used.
Not an exhaustive answer, just a few things your question brought to my mind. Any help?
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Be Worthy