I use the "Light" American Beauty tweezer handpiece, and have never felt a need for the smaller "Micro" handpiece and I work in N-scale through O-scale.
I also use my American Beauty 250W Soldering Station to fabricate turnouts, track feeders, build etched brass models and to work on and modify various brass models in various scales, but mostly N-scale for myself.
If you're contemplating purchasing a new resistance soldering station, I would also get the "Ultra-Light" probe with the 3/32" Carbon Electrodes. I use the probe, which I sharpen with a grinder, for many of my brass model building projects where the Tweezer handpiece would be difficult or impossible to use such as soldering .006" grab irons on to the surface of my brass caboose projects with 96/4 Tin/Silver silver bearing solder instead of drilling a hole in the body to mount them, and doing the same process on cast-brass steam and sand domes on various brass steam locomotives that now have separate grab irons there instead of their funky stock cast-on ones.
An additional tool that I wish I hadn't waited so long to get is Micro-Mark's Grounding Vice which adds a third hand and grounds my model simultaneously allowing for much more precise placement of small parts without having to find a place on my delicate model to clamp my grounding cable to. Find that here:
https://www.micromark.com/Grounding-Vise-For-Resistance-Soldering-UnitAmerican Beauty also makes a Grounding Table, but it's nearly 3 times the price, but offers their "tapered pins" connectors rather than ring terminals.
As usual, for metal models and track fabrication, I highly recommend the best soldering flux made for model-building and track fabrication...Superior No. 30 Supersafe Soldering Flux (gel) and solid-core 96/4 Tin/Silver silver-bearing solder available here:
https://www.hnflux.com/Have fun!
Cheerio!
Bob Gilmore