That's something you'd pick based on personal taste. I can hit just as hard with BG65 compared to other strings, and the key is that the tension is right for you and the strings are new. I restring my racquets probably every month at most and the fresh string has a significant impact on the power and repulsion. With old string, I can hit maybe just 80% as hard as when it's fresh, which is a much greater difference than a racquet can make.
You can try BG80 as that is one of the popular strings for hard hitters. BG66UM and NBG98 are also good choices but being on the thinner side they are less durable.
Agree. Back in my smashing and power play days my strings of choice were BG80 or BG80P. Excellent repulsion combined with decent durability to take all the bashing. Never tried NBG98 and not that popular at my club so can't comment there. While BG66UM is good, I think it's a bit fragile for power play. The players at my club who use it tend to break it frequently and they're not even "power players".
