Hi evs,
There isn't really a definitive answer to this question, because different equipment works better in different circumstances. It may depend partly on which make of DSLAM is used in your local exchange. Certainly the Netgear DG834 has a well-deserved reputation for holding on to sync down to very low noise margins. But in my case the Speedtouch ST546 performs rather better on a similar line to yours (~6Mbps sync), and as it happens the DSLAMs are Alcatel (same manufacturer).
Eric