The Runner plus is a big improvement over the Runner 2 - Three items on the plus make it a better buy -  1)Compression fork,  2) seven speed shifter and the 3) speedometer.   We also have Mini 4 and a Mini ST, my wife rides the Mini ST and I ride the Runner Plus on a our daily rides (15-20 miles).  Both Minis go on our RV trips.   The Runner plus is a softer ride then the Mini4 but seems to lack the sporty feel and some of the uphill torque.  I have ridden the Mini 4 1200 mile since Oct 2021 and the Runner Plus 600 miles since Jan 4 2022.  One thing for certain, at my age (77) step through models are much better.

We have a Mini 4 and Mini ST plus the RR+.  I have the Mini 4   for RV trips and ride the RR+ daily about 18-20 miles per day with my wife pedaling along on her Mini ST.  I purchased the Mini 4 last fall because it was available to ship when ordered whereas my wife waited 2 months for the mini St.  I purchased the RR+ after having problems dismounting the Mini 4 (5'4 and age 77, just not nimble enough these days).  In any case all three bikes are very good to ride and the best comparison I can make is the Mini's are like riding sport cars and the RR+ is more like riding a Buick.  The Mini's have more torque and can easily make it up the very difficult hill we have on our ride - I have to downshift on the RR+ to make it up that nasty very steep hill.  Which ever model you purchase, - get the Step through.   The one thing I do prefer on the RR+ is the handlebars, I find them more adjustable.  I have ridden the Mini a tad over 1200 miles and so far have just under 400 miles on the RR+ since Jan 4 this year.     A word of warning you will need a better seat post and seat for both bikes.

Enjoy your new bike

Consider the speed these bikes cruise at you should shop for a MIPS certified helmet that fits well.  Skip the cheap bargains and get one that will protect your brain if you have a crash. 

Most of those items are in the assembly kit that comes with the bike.  I either had or purchase other recommended items locally