Since boosters rollover as long as you keep your base plan active each month on prepaid it's usually much better for people who use their phone rarely. Check out the prepaid plans to see if they fit your needs better. http://koodomobile.com/en/on/plansand...
You'll have to do your own calculation. Check the last 3 bills and price your usage out both ways.
The lightweight Canada-wide $35 keeps your tab alive, makes Canada-wide your free call area and includes some data as well.
Going prepaid, the minutes seem to multiply like tribbles. Every wrong number (in or out), reaching a voice mail or checking your own costs you minutes, rounded up to the nearest whole number. I hardly use my landline at all and it's no trouble at all to rack up 100 minutes of use in "tribble" calls.
And not everyone is polite enough to call you when your minutes are of the free, after hours variety.