I vote for speaker terminal. Because yeah I remember sometimes, well if anything goes wrong with a SVS, it's usually the amp, which then sometimes destroys the driver (IIRC).
If it's easy to keep all components as "separate", that's what I vote for.
I just ordered my first Neutrik Speakon connectors. They would look cool on your subs. I've been told they are impossible to tug out as well. They are like $3 for either the post, or the plug. They come as 2-pole or 4-pole, and you would only need a 2-pole (but 4-pole works just fine; just use 2). I suppose you could even do a single 4 conductor wire from the amps to the two subs (splitting the conductors up at either end: from respective amp, and at the respective speakon posts). I suppose that's only worth looking at if the subs are placed somewhat close to each other, and that wire mgmt is somewhat of an issue. Oh, that would also assume the use of pro amps, that have speakon to begin with.
But, don't quote me, this is totally brand new to me.