Money money money
What you desire to achieve - to be in Canada with wife and child - is possible through every possible permutation and configuration:
1. stay here and apply together from here
2. you go to canada and sponsor them to come
3. you both go there and apply from there
The caveats under each of 1) 2) and 3) come down to your financial resources and the amount of time you're willing to be away from each other.
In order:
#1. under this route, you will have no 'away time' from each other, however they will want to see that you have the financial resources to support your wife and child coming to Canada and establishing permenant residency. you technically have to call out a 'date you will come to Canada'. If you have hundreds of G's in the bank, they can see that you can come whenever you want, and can establish yourself at your leisure. If you don't like the rest of us, they're gonna want to see things like a job offer, an employment contract with a definitive start date etc.
#2. under this route, wife and child stay here, while you go to Canada. Because you're away, in theory, this route will get processed the 'fastest' because you're away from each other. the caveat is that the current advice of the embassy is that it could take anywhere from 6-14 months to process this type of application. so in theory you're in Canada, working, while wife is here. Money is good, but time away from each other is bad.
#3. under this route, you've done #2, but wife also gets a TRV and comes to 'visit' you in Canada. Lots of if's here, assuming she's eligible for TRV. the application for TRV and PR are not related to each other. They're totally separate and evaluated by different people. Now on a TRV, she can't work in Canada. So she's a liability to you. You have to be able to demonstrate that you and/or her have the financial ability to support her costs and medical needs through the duration of her stay. Hard to do for most Dominicans. Having savings as a Canadian helps argue this case. Note the TRV has an end date. Once she's in the country, your application has changed and will not be processed by the SDQ office anymore, so this process will take longer. So it could result in some 'away' time to renew her TRV etc.
So in short, the answer is, it 'depends'. How much money do you have saved up? How desperate are you to make the process go faster in time. How much time are you willing to spend away from each other?