How Wide Should Your Strikes Be In A Credit Spread?

Got the following question this week:

First, thank you for providing a great service. I have been trading options for about a year and have learned a lot from your tips and alerts.

Now, I have a question about position sizing.  I am trading $100k of my funds using your alerts. When you send out an alert I multiply the number of contracts by 10 when putting on the trade. My question is: instead of just multiplying the contracts, can I use a combination of increasing the contracts and/or increasing the width of the strikes?

For example, if the alert was to sell 2 SPX 1200/1210 Calls, instead of selling 20 10 point spreads, could I sell 10 20 point spreads? What would be the pros/cons of doing something like this?

It seems to me, if I widen the strikes, then when I need to make an adjustment, I could sell the near strike [...]