141 Commercial go for it!
The 141 commercial is a 120 hour program. The 120 hours include 55 hours of dual and 65 hours solo. 141 (a)(1) is 120 of training which includes dual and solo. 141 (b)(i) is the 55 hours of dual needed.
If you go 141, you'll do 120 hours which will have you at 220 hours when you get your commercial SEL since you already have 100 hours.
Don't let the difference in dual time with the 141 program stop you from going that route.
Here's the scenarios:
Part 141
35 hours more dual time than Part 61. If the instructor is $35/hr then you'd pay $1,225 more for the instructor under 141. But you are done at 220 hours
Part 61
Since you have 100 hours you'd need 150 more hours total. That's 30 hours more than part 141. Those extra 30 hours will be done solo and if we assume an aircraft rental rate of $110 an hour the cost would be $3,300.
Conclusion
$3300-$1225=$2075. With the above example you would save $2075 by going Part 141.
Hope this helps.