This is either an attempt at trolling, the OP is 10 years old, mentally handicapped or some combination of the three.
Zack Ryder is a mid-card guy for life. Nothing wrong with that necessarily, but there's no real money to be made with him any higher up than he is. Fans wanted to see him pushed for a long time, but they quickly lost interest when he got pushed to the United States Championship spot; I don't know if they were trying to be ironic or were just sorta supporting Ryder because they didn't expect WWE to get behind him or what but, whatever the case, Ryder lost momentum and fan interest about a week after he won the title.
Taker's been unrelentingly loyal to WWE and he's made a shitload of money for the company. Before Taker's body started to go downhill, nobody put in as much time as he did and part of the reason his body started to go downhill was because he put so much time in. What I mean by that is Taker would push himself to work through injuries when what he needed to do was to take time off to let his body heal up or, in a good many cases, kept putting off surgery required to fix injuries or to repair injuries that'd been worsened because he didn't take time off. In a lot of those instances, Taker waited too long to undergo the procedures and that when he finally did have them done, their effect was greatly reduced; for instance, Taker needed surgery on his shoulder, I forget if it was the left or right, but he put it off for so long that the surgery didn't really help and, as a result, he's never regained the full strength he once had in that arm. Reasons why he'd delay taking time off were because said time off would require him to miss time in which the company needed him the most and because the money was to good to not push through.
Factoring that in along with the money Taker has brought into WWE over the years....then no, Zack Ryder doesn't deserve anything more than the Undertaker. In fact, if Taker ever asks Ryder to help him with his bags, Ryder should probably consider himself lucky as it's the biggest thing he'd have ever really done in his career.