I'm going to have to go with BBS and AVB on this one - why dilute a good whisky down with soda? I'm not trying to give you a hard time, I'm just saying, if you like the whisky then adding soda to it would put a damper on the flavors and aromas. So I guess if I were dead set on having a scotch and soda, I'd use the cheapest scotch that was drinkable, probably White Horse or, if that isn't available for you (I have trouble finding it sometimes) Dewars or Famous Grouse. I think J&B would be too weak to mix, and JWB and Chivas are too good to waste that way (for me).
I guess, if you're going to do it, do it with what tastes good to you.
Scotch with a dash of club soda was, for many decades, the preferred way of enjoying Scotch, actually. Just remember, soda as in club soda, not as in soda pop (I don't know how many times I've had to stop a bartender from topping my rocks glass off with Coke when I ask for a "Scotch and soda" :laugh: ). Churchill used to start every morning with a bottle of Johnnie Walker Red Label and a cold siphon of seltzer water. Definitely not for everybody, but I enjoy it with some whiskies. Just a dash can give you a nice effervescent tingle on the palate that accentuates some of the smoky, malty flavors...but it's not a good combo for every whisky...most Islay whisky tastes downright awful with soda.
Speaking of Churchill and his fondness of Johnnie Red, a great connoisseur of Havana leaf I've had the pleasure of corresponding with on another forum actually won't touch single malt but only drinks blended or vatted Scotch! :0 In his estimation, single malt can't compare to great blended Scotch. As a caveat though, of recent bottlings he only buys the real expensive ones, like Ballantine's 30YO. The rest of his cabinet consists of vintage bottles from the 1950's and earlier.
I'd always wondered why blended Scotch was held in such low regard compared to single malt, since one would believe blending allows you to make something better than the sum of its parts, as in the case of cigar leaf (you don't see too many single vega cigars, do you?). I agree with his theory...single malt isn't popular because blended Scotch is inferior...blended Scotch is inferior because single malt is now so popular! :laugh:
Even the almost-universally reviled Johnnie Red, when sipping a bottling from the 50's or before, is actually excellent Scotch, he says, which might explain why Sir Winston was so fond of it. It seems that now that individual distilleries can make so much money bottling their product themselves instead of selling to blenders, that the best barrels are sold single malt and the blenders can only get what's left over, resulting in an inferior product from what you would've gotten had you picked up a bottle of Johnnie or J&B back in the 40's or 50's.
I'm surprized there aren't any old timers around here used to taking their whisky with a splash of seltzer.