I ran one of the older version the 880 and liked it. It is pricey, but will run a long time. If you ride at least 5k a year you should wear it out before it gets too old. But if you only ride 2k or so a year it will get really old before you wear it out.
Now it is a touring tire made for long distance, if you like to drag your pegs all the time you might want to go with a sporty ( softer, stickyer ) tire.
The 140/90 15 should fit fine on your bike, a lot of us run that size from a bunch of brands.

I've been running the 140/90 Metzler 880 on my bike for years (yes I have worn a few out) without any problems. A plus is that it makes the speedometer read closer to actual speed instead of 10% faster than actual with the OEM tire.

We put an ME880 150/80-15 on at 12k kms, and it's at 42k kms now and still plenty of tread. The gf likes it, she can get around corners faster than I dare.

I run the K671 130/90/15.  Good looking tire imho (I wanted close to an enduro look) and you can't tell a size difference looking at it.  But there's more room under the rear fender, no risk rubbing bolts with a passenger...

I change my 20 years old tires at first and got my a 150/80 Bridgestone on the rear wheel.

And a 100/90 in the front!

https://bikeswiki.com/Suzuki_LS650_Savage_(Boulevard_S40)

The 150/80 fits and a lot of space over!

Both Bridgestone!