Transaction-Weight-vs-Symbol-Ranking-by-Indicator

Transaction.Weight applies to entry orders to determine which transactions should be preferred in case where there are more candidate transactions than allowed by the available equity.

The Symbol Ranking by Indicator condition lets you choose symbols that are ranked in the bottom/top of the DataSet based on indicator of choice before creating an entry order. Check out how @Glitch explains it:

https://www.youtube.com/watch?v=uEhS68htp9M&t=228s

They do seem similar, but T.Weight won't preclude/block a Signal from occurring.
Symbol Ranking by Indicator will do that, and is definitely the right choice when using Stop/Limit orders.

Ok, thanks (in other words, if I set the symbol ranking parameter to my portfolio size, no symbol will be excluded and both conditions do the same? It would produce less code in this case by using transaction weight.)

That's a good example. No, not the same. I only said they "seem similar". If Symbol Ranking included all the symbols, it has no effect whatsoever... because it's not being used to filter anything.

T.Weight always (whether you assign it or not) has the effect of the order Transactions are processed. Transactions processed first have access to more buying power.