Let’s compare main 7 differences

Cost $50 $1500 ~ $1800
Revision No Cost Same cost
Teachers Quality JLPT N1, 7 Years Japan exp, 10 years work-ex If qualified enough, the cost will be much higher
Content Quality Divided as per level and gradual increase Random contents
Time Flexible and duration length as you wish Fixed duration and No flexible timing
Transport Your Bedroom Rain, Metro-charges, Sun-tan, sweating
Support Wall Not at all