Used a D4x4 one in competition for years- found 2 thihngs- 1. it is very very heavy and 2 i have to weld a reinforcing brace into it.
having said that the blade angle is perfect and it digs in well- the recovery loop on top of the blade is a god send- you drive the vehicle up past the anchor and pull it out- saves a very hard job getting the thing out.
The x-eng one is a vast improvement in utility- its far far far lighter, but doesn't suffer strength wise as far as i can see- there seems toi have been as many X-eng failures as D4x4s so the lightness seems about right- good design has made up for the reduction in weight. You do have to use them as deisgned in a straight pull though.
If you want a really easy time of it then you could use
http://www.pullpal.com/aboutPP.html these are amazing and we often take one away on expedition- however they are very very expensive- easily £400 for one that puts up with the weight of a lardcruiser.
other options- the pin type- well they are very veyr strong and secure. Have seen engineers and tank regiments using them to winch CEVs up hills. But they take bloody ages and are very hard work so not much use if you have use one frequently.
YOu can make a very good anchor with 4 stout poles and some rope- basically bang the 4 poles halfway into the ground in a line (the distance between the poles should be the same as the height of the poole above the ground). Attach your winch rope to the bottom of the first pole. Using winch rope or similar attach the top of the first pole to the bottom of the second, then attach the top of the second to the bottom of the first and so on.
This works so well because you are mutiplying the force of the pull through levering against the ground- the force against the poles is exactly horizontal to the ground- thers is no upwad pull.