Hard to say any one method is the best, depends.Is this the best available option as it updates your pie?
For me, I want to be risk averse and am quite content with matching the return of the big indices. The best solution to do so is typically ETFs, but they are taxed awkwardly and unfairly in Ireland. So, I set up a pie on 212 that mimics the top 50 or so of the S&P index with the weightings adjusted accordingly. So for example, if Apple are say 12% of the S&P 500, I give them 12 divided by the sum of the top 50 weightings, thus they come out at about 13%, which is what I set them to in my pie.
Do this for all of the top 50 and you have a diversified portfolio that closely mimics the returns of the S&P500 and ETFs that track it, with just 33% plain old CGT on disposal to worry about.
You can set the pie to always try to rebalance to your given weightings, or to continually split your future inputs as per the weightings each time. I go with the former as I believe that best aligns with the tracked index, although I’m not sure it matters much.