Is it worth waiting for the lower price or does it not make a difference?
Doesn’t matter if you convert 50 shares of a stock at $300/share or 100 shares of a stock at $150/share. Either way it’s $15000.
If you think the total value will change due to the split (ex. you expect the price to go up a bit because you think people will think the split is a good sign) then that difference in price would make a difference. IMO most any positive or negative impact to the price from a split gets priced in almost immediately when a split is announced, so I would not expect it to change in that way.