lol this is the second time in the past hour I've answered this question, a mod really needs to sticky this.
Don't worry, updating through Nintendo WILL NOT BRICK your Wii. All it will do is delete your Homebrew Channel and you will have to resoftmod.
If you don't want to lose your softmod, then you can update using Waninkoko's 4.1 or 4.2 updater. Only update to 4.2 if it is absolutely necessary. If Tiger Woods 10 only needs 4.1 update, then only update to 4.1 update.