On first glance, it seems obvious that the SMS is the way to go.
However, on further thought (and reading through this thread) if you're maxed out on Crisis suits you can add Broadsides (expensive Crisis suits) with Plasma Rifles that have worse movement capabilities (but better save) than a Crisis suit and oh-by-the-way have a really kick-ass Railgun as a second weapon...
Personally, I like the SMS. A full 3-man Broadside team can put out the same twelve 5/5 shots from the SMS as a full FireWarrior squad with pulse rifles. The plus is that it doesn't need to be line of sight. The minus is that it is only 24" instead of 30".
In the end, you'd have to try both in several different types of games, mission and terrain and make your own call.
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