First, I think @bitflip has provided you with some very good answers. So I donāt want to repeat them.
I just wanted to add a couple of notes.
You mentioned you have a pension with Aviva? If you were considering transferring this pension, in full or in part, then you need to consider what benefits Aviva provide, and what you may lose by transferring to a SIPP.
Many pensions providers for example provide 100% protection on pensions, as compared to the 85k protection from the FSCS. With a SIPP youāre only covered up to the 85k. Youād need to check if what kind of pension you have and how itās covered with Aviva.
Also, many companies get a deal with pension providers to get a discount, or other services are bundled in.
That said, that doesnāt mean you shouldnāt transfer your pension. itās just something to consider.
On the all eggs in one basket. Iāll only add that Freetrades SIPP is managed by a third party. In the event of Freetrade going bust, from past examples, your SIPP is usually protected. I consolidate my pension into a SIPP by doing partial transfers every year, and transferred my old pension. But my pension isnāt a lot of money, thereās no advantage to splitting it upā¦ for me.
Advantages of leaving pensions with a pension provider is that you can basically set it and forget it. If youāre prone to changing things up and you donāt want to do this with your pension you might prefer it in an account you donāt access all the timeā¦ really depends on yourself. That said, always remember to check your pension at least once a year and make sure its in an appropriate fund (if a pension), or ETF or similar (if a SIPP) suitable to your age and risk appetite.