type of index on memory tables

[Alexander]

This topic is duplicate from Newbie forum. I think it would be more help here.

I use mysql 5.0.18.

I need some advice in what type of index to prefer when using MEMORY tables - BTREE or HASH?
I want to put in memory several tables with number of rows from 100 throuh 20000 in each. Not a lot I guess.

My memory tables contain a kind of categorized vocabulary with common table structure like this:
create table
(
id int,
name CHAR(200),
primary key (id),
{key | unique key} `name` (name)
)

There can be duplicates in some columns but I feel it would not be many of them.

Is it possible to gain meaningful time profit from choosing one index type and not the other when selecting from such tables? (selects may contain many joins with these tables)

Thanks for your help.