Are these your final options or could you perhaps consider a few other alternatives?
I agree with the pre-posters that you maybe should go for variety and as you haven't got a lowlander in your portfolio maybe you should consider a Bladnoch or perhaps even a Rosebank.
My experience with Bladnoch is somewhat limited and I haven't tried the mentioned bottling. For the moment I have only a few bottles of the Flora & Fauna Bladnoch plus the Chieftains 13y. finished in Rum Barrels. I like these two expressions very much although the Chieftain's has a lot more to offer in terms of complexity and flavours.
When it comes to Rosebank you have plenty of bottlings to choose from and I stilll haven't found a bad expression from this tragically lost distillery. Most of them are reasonably priced and I think you could find many of them in your country.
They are often flowery, herbal or grassy on the nose with a sweet, creamy, flowery, lemony or lavender palate.
In my opinion Rosebank is the ultimate lowlander and I recommend you to add a bottle to your collection.
When it comes to Bourbon, I am also rather new to this category. I haven't tried the Booker's but I recently bought a Evan Williams Single Barrel 1995 and a Buffolo Trace. Both were truly outstanding.
Here are my tasting notes for the Evan Williams:
: Charred oak barrels, violets, coconut, vanilla and dried fruits.
: Amazingly rich in flavours. Oak, hints of herbs, coconut, dried fruit, nuts and vanilla. Lots of toffee/caramel (butterscotch?). Very complex.
: Sweet, fruitcake, vanilla. Long and outstanding.
: In my opinion a great whisky that just beats the **** out of many scotch ones and leaves you stunned, gasping for more. For me, as a beginner of Bourbons, I could not imagine it would taste this good. For me this is the start of a friendship which shall never end.
As you stated yourself...You know you're gonna like the Lagavulin DE (which in my opinion is one of the best-ever whiskies
) and you've had the Ardmore. Go for something new...try a lowland whisky or head for a Bourbon. You're probably going to surprised in a very positive way.
As I haven't tasted the mentioned Bladnoch or the Booker's I don't submit my vote.