The only limit is the available code space!


Please don't do that!
If You want people to take the effort to answer your questions, the least you can do is take the effort to type properly!

The size of a lookup table is equal to the number of bytes you put in it!


With a lookup table, the access time is constant;
With a string of if..then...elseif...then...etc, the access time depends on how far down the list the required entry lies - for the 1st entry, it will be quicker; for the last entry, it will be slower (much slower if there's very many entries).

The if...then...else... structure is advantageous in some circumstances, as it effectively gives priority to the entries near the top of the list; so, if your data is such that a relatively small number of values occur more frequently than others, the average speed achieved might be higher.

On the other hand, a lookup-table is often easier to maintain than a string of if...then...else... when changes need to be made.

As always in engineering, there is no such thing as "best" - you need to weigh the pros & cons in the context of your specific requirements & constraints.