Buying International student health insurance with different payment options

Student Health Advantage plan from IMG:
Student Health Advantage plan is a student insurance option which satisfies most US Universities requirements. This is offered by International Medical Group (IMG). This plan provides coverage for pre-existing condition after a waiting period. This plan has provision to cover mental health, pregnancy, maternity, sports... There are 2 levels for this plan namely Standard and Platinum. The Platinum plan provides a higher policy maximum as high as $1,000,000. This plan can be purchased for any number of days or months. The plan has a maximum lifetime of 5 years. The premium payment can be made monthly or an upfront one-time payment for the duration as indicated in the application form. This is a comprehensive plan and meets the requirements of US international student visas like F1 and US research scholars visas like the J1 visa.
Study USA plan from USI Travel Insurance Services:
Study USA plan is a plan from the company USI Travel Insurance Services. This plan is suitable for students on F1 Visa and research scholars on J1 Visa. This plan is available for a year and the payment is one time upfront payment for the selected duration. This plan is unique compare to the other student plans where it provides 100% coverage for one wellness checkup for the certificate period of the plan. There are 4 levels in this plan namely Basic, Standard, Preferred 300 and Preferred 500 with the change in the policy maximum options. There is coverage available for pre-existing conditions after a waiting period and coverage available for pregnancy in this plan except the Basic plan.
Liaison Student Series from Seven Corners:
Liaison Student Series plans from Seven Corners have been recently redesigned to make it popular with international students coming to the US. The plan has three levels namely Liaison Student Economy, Liaison Student Choice and Liaison Student Elite. The premium payment for these plans need to be made upfront at once. These plans have a unique benefit where vaccinations are covered as required by the school or the University. Comparing the plans might be helpful to choose the right one. The plans have a lifetime maximum of 364 days and can be renewed up to this time.
Patriot Exchange from IMG:
Patriot Exchange plan is from IMG and is available for international student on F1 Visa and research scholars and exchange students on J1 Visa. The premium payment with this plan is one time upfront payment for the opted duration. The plan has a special benefit where it is available to the spouse on F2 or J2 regardless of F1 or J1 being as the primary holder on the plan. This is not available with the other plans. This plan has a maximum lifetime of 2 years and the plan can be renewed after 12 months.
Student Secure plans from TokiomarineHCC:
The Student Secure plans offered by Tokiomarine HCC is one of the more popular plans among the student insurance options for international students on an F1 Visa and research and exchange scholars on the J1 Visa. This plan is another plan that has the flexibility of making the premium payment on monthly basis. This plan has four levels namely Student Secure Select, Student Secure Budget, Student Secure Smart and Student Secure Elite. The Elite plan has the highest policy maximum option of $1,000,000 and the others vary and have a lower policy maximum. The plan is renewable and can be renewed every 6 months. It can only be renewed continually for 4 years after which a new plan must be purchased.