REL Vs SVS for 2 channel music listening

Is there any advantage of a 12 inch woofer vs 10 inch? The Rel t/9i has a 10 inch woofer 300 watt amp. The SvS has a 12 inch woofer with 500 watt amp. 

The Sumiko's actually look like nice subs. Yes, they seem to be a REL copycat (Sumiko use to distribute REL).

In very broad terms the larger the driver,  the deeper it will go and the louder it will play without distorting. Conversely in very broad terms, the smaller the driver the more dextrous it will tend to be but will not go as deep. If you take a look at the entire REL line-up,  I believe they have 9 subwoofers total. 

Part of the REL philosophy is to find the subwoofer match for your speaker system and listening area. I'd suggest heading over to a shop that carries both SVS and REL and listen to them in a 2 channel system. 

Well i ordered the svs sb2000.  An audiophile friend I trust told me the SVS blends really nice with 2 channel and i should buy another if all goes well.  So we’ll see. Ill report back once up and running

Don't forget to treat yourself to an Antimode 8033 room eq as well.