Money Metals Exchange's Monthly Accumulation Program is the only structured, automated dollar-cost-averaging option among the dealers we've reviewed — if you want to stack silver on a recurring schedule without manually placing individual orders, this is a genuine feature gap versus SD Bullion and most other competitors.
This is worth addressing directly: SD Bullion's Trustpilot score (4.8/5) is notably higher than Money Metals Exchange's (3.3/5). We'd recommend reading recent reviews on both platforms directly before purchasing, particularly for larger orders, given this gap.
Money Metals Exchange operates its own in-house depository in Eagle, Idaho with Lloyd's of London insurance — a unique vertically integrated setup. SD Bullion focuses purely on low-premium sales without an equivalent proprietary storage option.