I am going to throw another factor out there to consider. Damage control.
I used factory sized Team Dynamics (16-17) wheels for a while. They were great, but my track will periodically develop ruts right off the curbing on track out. I am sure this does not happen anywhere else
What happens is, I will drop one of my back wheels off the curb every so often. That is not a problem in and of itself but coming back on track means that I am hitting a sharp 90 degree concrete curb with the inside of my tire/wheel. I destroyed one wheel/tire, replaced it, then bent the new wheel the next weekend. Because of the way that Team Dynamics wheels are made you cannot "repair" a bent wheel. Technically they can make it straight again but will not certify it to be safe at 90 mph.
I switched to 15-16 Ethos wheels because they provide about an extra inch of rubber over the rim. The overall package is also lighter. The Ethos wheels were the lightest per strength/dollar. I did not weigh them but they are noticeably lighter than my previous setup and seem to be better at handling my semi-off-road driving style. I have never bent one after numerous "drop-offs". They balance easier than my Team Dynamics. They are also a bit shorter so the gearing is a bit lower and the car sits lower which also helps handling.
205 Toyo RA1 fronts
245 Toyo RA1 rears
My prior setup was:
16-17 Team Dynamics (now my street wheels)
195 Toyo R888 fronts
235 Toyo R888 rears
My lap times are better with the new setup but it is not an apples to apples comparison. I am a much better driver now and the car has other upgrades so comparison is not relevant.
I am also not claiming that everyone should switch to this setup, I have other modifications which make this setup a better option for my car and my skill level (or lack of skill as it may be).
The Ethos wheels are lighter than the Team Dynamics, price is comparable, and the Ethos seem to be stronger. I realize that I have about an extra inch of rubber but many major spins etc have not resulted in the slightest bit of damage or imbalance in the wheels. That was not a trait of my Team Dynamics wheels. Obviously this could be luck and it is definitely influenced by the tire/wheel ratio... which is my primary point.
I would consider buying the Ethos for street wheels on style points as well. Would be cool if you could get them in different finishes but I like the flat black. I think I might prefer gloss or satin finish for street wheels but flat hides the fact that I was at the track over a month ago and have not found the motivation to clean the car yet. Am I right?
The five spoke design is super easy to clean. Which is a big deal for me, I am not an auto detailer, it is just not in my blood. I want something easy to maintain.