Generally we end up settling for less.
Totally agree with you Prateek , 2 subs for a smoother bass response. But as efernand1 has also suggested more prudent to go for one at first. Then it is the OP's choice in the end for the 2nd subwoofer. Sometimes 2 big subs may be overwhelming for a room if the room is small. Then in that case 2 smaller subs makes more sense.