Neither !
Teach your DC yourself. I am sharing the approach I followed for DD. Hope it will help you too. I'm assuming your DC is in KS1
Letts KS1 revision guide
Letts KS1 Practice workbook
Sign up on Khan Academy www.khanacademy.org/
Print out KS1 National Curriculum targets from www.gov.uk/government/uploads/system/uploads/attachment_data/file/335158/PRIMARY_national_curriculum_-_Mathematics_220714.pdf
We spend 15-20 mins doing maths every week day. Weekends were random. Sometimes we did a lot, sometimes nothing.
Day1 : Choose topic1, read the revision guide (for that topic) with your DC. Use examples to practice together
Day2: Complete practice exercises from the practice workbook
Day 3: Take lessons on Khan academy for Topic1
Day4. Further practice using worksheets printed from the internet
Day 5 : Revision (previous topics) and more practice
We roughly followed this plan. Depending on the mood etc, we varied things sometimes. We did 5 mins of additions and subtractions every day (slowly ramping up difficulty - in Kumon style). In later stages, we did times tables and mental maths alternately for 5 mins everyday.
We did bond assessment papers on weekends (age appropriate). They have a variety of problems. So it encourages the children to think and apply what they learnt. Whatever little you do, do it thoroughly. Make a note of gaps and go over those topics again.
I have to clarify here, "topic" means 1 concept that cannot be broken down further. For example in fractions, halves is 1 topic. Quarters is another topic. On a good day, you can cover both of these in 1 session. But I strongly recommend you go with how much your DC can comfortably learn in one session. Don't overdo it. Just 15-20 mins a day is enough.
Mastery in maths can make a world of difference to your child's confidence and his/her future.
If you'd like to know anything more, please feel free to ask. Happy to help.