If you want to buy now, it's not a bad time and you can accumulate it over the next few months.
In the layer 2 race for now arbitrum looks like the winner, but there are few more layer 2 upcoming which seems better than top 2 layer 2 in the market right now. Manta just released their token few days ago and their TVL growth was impressive. Also they are using the best technology in the market so they just need a proper marketing and partnership to get a top position. Their TVL is almost 1 billion right now so it won't be hard to get a few billion dollars if they can keep the hype going.
not to mention blast coming from the dev of blur is also hoarding that $1.5 billion if im not mistaken in their staking program that directly equates to point for future blast token release.
its just overall fierce competition with L2 and I think everything will significantly change in the future, the L2 of today, that are having some good pump, might dump in the future.
I personally would prefer the new coin though since they are just more future proof and haven't reached any all time high yet.