KTM makes great motorcycles.
They don't have very good dealer support and take more to maintain than most bikes.
You already have one so you know.
Honda makes great motorcycles.
Their dealer support is great and have decent service intervals.
If you want to ride, not worry about the bike so much, get a Honda.
Bingo!!! What
he said!
I have owned multiple orange bikes and I like them for what they are but I'll keep those purchases to two-strokes going forward. I also considered a Husky 501 when I was shopping for my new big bore thumper and after considering the dealer network aspect, parts, price, and overall reliability reputation I went with the 450L in the end.
I've had it for over a year now and it's reserved for weekend dual sport trips and out of state enduro rides so I am still under 3,000 miles but 85% or more of those are completely off-road. No maintenance or reliability issues and I wouldn't hesitate to take her around the world tomorrow with proper dual sport rubber and some slightly larger saddle bags.
I have started extending my oil change intervals past the recommended 600 miles. I got great feedback on the 800 mile interval analysis so I have decided to push it to 1,000 miles this time and I'll see what Blackstone has to say about it at that time. Should the results come back as I expect I might try 1,200 miles next but I am ok with sticking to 1,000 mile OCI's from here on should the oil life and content not look as good as I like on the 1,200 mile analysis. I use standard Honda GN4 dino oil and Honda o-rings and filters which I change every time. I can change the oil for $10 using factory supplies, that's cheap.
When comparing the KTM 500/Husky 501 to the 450L you'll get better stock suspension, better on road ride, better lights, and a lower purchase price with the 450L. Aftermarket still favors the Austrian bikes but the aftermarket is quickly catching up with the 450L and it's only been around for less than two years. With the newer counter balanced KTM's I think they are equally as smooth as the Honda, and both the KTM and Husky will make slightly more power out of the box, albeit only 1-2 HP more if you use a Vortex ECU and exhaust on the 450L, which I highly recommend.
In closing I don't think you can go wrong either way, they are both great bikes with their own array of perks and qualities both good and bad. So pick one based on your local dealer network, if that matters to you (in this day and age you can get anything online in a few days), or buy based off of price or even by which one you think looks better. Best of luck with your decision and be sure to start a build thread once you do bring one home, this portion of the forum needs more traffic.